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llvm-project/llvm/test/Transforms/ConstraintElimination/gep-arithmetic.ll
Florian Hahn fbcf8a8cbb
[ConstraintElim] Add (UGE, var, 0) to unsigned system for new vars. (#76262) 
The constraint system used for ConstraintElimination assumes all
varibles to be signed. This can cause missed optimization in the
unsigned system, due to missing the information that all variables are
unsigned (non-negative).

Variables can be marked as non-negative by adding Var >= 0 for all
variables. This is done for arguments on ConstraintInfo construction and
after adding new variables. This handles cases like the ones outlined in
https://discourse.llvm.org/t/why-does-llvm-not-perform-range-analysis-on-integer-values/74341

The original example shared above is now handled without this change,
but adding another variable means that instcombine won't be able to
simplify examples like https://godbolt.org/z/hTnra7zdY

Adding the extra variables comes with a slight compile-time increase
https://llvm-compile-time-tracker.com/compare.php?from=7568b36a2bc1a1e496ec29246966ffdfc3a8b87f&to=641a47f0acce7755e340447386013a2e086f03d9&stat=instructions:u

stage1-O3    stage1-ReleaseThinLTO    stage1-ReleaseLTO-g  stage1-O0-g
 +0.04%           +0.07%                   +0.05%           +0.02%
stage2-O3    stage2-O0-g    stage2-clang
  +0.05%         +0.05%        +0.05%

https://github.com/llvm/llvm-project/pull/76262
2023-12-23 15:53:48 +01:00

633 lines
28 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
declare void @llvm.assume(i1 noundef) #0
define i1 @gep_constant_positive_index(ptr %dst, ptr %lower, ptr %upper) {
; CHECK-LABEL: @gep_constant_positive_index(
; CHECK-NEXT: [[DST_ADD_4:%.*]] = getelementptr inbounds i8, ptr [[DST:%.*]], i64 4
; CHECK-NEXT: [[PRE_DST_LOWER:%.*]] = icmp uge ptr [[DST]], [[LOWER:%.*]]
; CHECK-NEXT: [[PRE_DST_UPPER:%.*]] = icmp ult ptr [[DST_ADD_4]], [[UPPER:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i1 [[PRE_DST_LOWER]], [[PRE_DST_UPPER]]
; CHECK-NEXT: br i1 [[AND]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK: then:
; CHECK-NEXT: [[RES_1:%.*]] = xor i1 true, true
; CHECK-NEXT: [[DST_ADD_3:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 3
; CHECK-NEXT: [[RES_2:%.*]] = xor i1 [[RES_1]], true
; CHECK-NEXT: [[RES_3:%.*]] = xor i1 [[RES_2]], true
; CHECK-NEXT: [[RES_4:%.*]] = xor i1 [[RES_3]], true
; CHECK-NEXT: [[RES_5:%.*]] = xor i1 [[RES_4]], true
; CHECK-NEXT: [[DST_ADD_5:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 5
; CHECK-NEXT: [[CMP_DST_ADD_5_UPPER:%.*]] = icmp ult ptr [[DST_ADD_5]], [[UPPER]]
; CHECK-NEXT: [[RES_6:%.*]] = xor i1 [[RES_5]], true
; CHECK-NEXT: [[RES_7:%.*]] = xor i1 [[RES_6]], [[CMP_DST_ADD_5_UPPER]]
; CHECK-NEXT: ret i1 [[RES_7]]
; CHECK: else:
; CHECK-NEXT: ret i1 false
;
%dst.add.4 = getelementptr inbounds i8, ptr %dst, i64 4
%pre.dst.lower = icmp uge ptr %dst, %lower
%pre.dst.upper = icmp ult ptr %dst.add.4, %upper
%and = and i1 %pre.dst.lower, %pre.dst.upper
br i1 %and, label %then, label %else
then:
%cmp.dst.lower = icmp uge ptr %dst, %lower
%cmp.dst.upper = icmp ult ptr %dst, %upper
%res.1 = xor i1 %cmp.dst.lower, %cmp.dst.upper
%dst.add.3 = getelementptr inbounds i8, ptr %dst, i64 3
%cmp.dst.add.3.lower = icmp uge ptr %dst.add.3, %lower
%cmp.dst.add.3.upper = icmp ult ptr %dst.add.3, %upper
%res.2 = xor i1 %res.1, %cmp.dst.add.3.lower
%res.3 = xor i1 %res.2, %cmp.dst.add.3.upper
%cmp.dst.add.4.lower = icmp uge ptr %dst.add.4, %lower
%cmp.dst.add.4.upper = icmp ult ptr %dst.add.4, %upper
%res.4 = xor i1 %res.3, %cmp.dst.add.4.lower
%res.5 = xor i1 %res.4, %cmp.dst.add.4.upper
%dst.add.5 = getelementptr inbounds i8, ptr %dst, i64 5
%cmp.dst.add.5.lower = icmp uge ptr %dst.add.5, %lower
%cmp.dst.add.5.upper = icmp ult ptr %dst.add.5, %upper
%res.6 = xor i1 %res.5, %cmp.dst.add.5.lower
%res.7 = xor i1 %res.6, %cmp.dst.add.5.upper
ret i1 %res.7
else:
ret i1 false
}
define i1 @gep_constant_negative_index(ptr %dst, ptr %lower, ptr %upper) {
; CHECK-LABEL: @gep_constant_negative_index(
; CHECK-NEXT: [[DST_SUB_4:%.*]] = getelementptr inbounds i8, ptr [[DST:%.*]], i64 -4
; CHECK-NEXT: [[PRE_DST_LOWER:%.*]] = icmp uge ptr [[DST]], [[LOWER:%.*]]
; CHECK-NEXT: [[PRE_DST_UPPER:%.*]] = icmp ult ptr [[DST_SUB_4]], [[UPPER:%.*]]
; CHECK-NEXT: [[AND:%.*]] = and i1 [[PRE_DST_LOWER]], [[PRE_DST_UPPER]]
; CHECK-NEXT: br i1 [[AND]], label [[THEN:%.*]], label [[ELSE:%.*]]
; CHECK: then:
; CHECK-NEXT: [[CMP_DST_UPPER:%.*]] = icmp ult ptr [[DST]], [[UPPER]]
; CHECK-NEXT: [[RES_1:%.*]] = xor i1 true, [[CMP_DST_UPPER]]
; CHECK-NEXT: [[DST_SUB_3:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 -3
; CHECK-NEXT: [[CMP_DST_SUB_3_LOWER:%.*]] = icmp uge ptr [[DST_SUB_3]], [[LOWER]]
; CHECK-NEXT: [[CMP_DST_SUB_3_UPPER:%.*]] = icmp ult ptr [[DST_SUB_3]], [[UPPER]]
; CHECK-NEXT: [[RES_2:%.*]] = xor i1 [[RES_1]], [[CMP_DST_SUB_3_LOWER]]
; CHECK-NEXT: [[RES_3:%.*]] = xor i1 [[RES_2]], [[CMP_DST_SUB_3_UPPER]]
; CHECK-NEXT: [[CMP_DST_SUB_4_LOWER:%.*]] = icmp uge ptr [[DST_SUB_4]], [[LOWER]]
; CHECK-NEXT: [[RES_4:%.*]] = xor i1 [[RES_3]], [[CMP_DST_SUB_4_LOWER]]
; CHECK-NEXT: [[RES_5:%.*]] = xor i1 [[RES_4]], true
; CHECK-NEXT: [[DST_SUB_5:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 -5
; CHECK-NEXT: [[CMP_DST_SUB_5_LOWER:%.*]] = icmp uge ptr [[DST_SUB_5]], [[LOWER]]
; CHECK-NEXT: [[RES_6:%.*]] = xor i1 [[RES_5]], [[CMP_DST_SUB_5_LOWER]]
; CHECK-NEXT: [[RES_7:%.*]] = xor i1 [[RES_6]], true
; CHECK-NEXT: ret i1 [[RES_7]]
; CHECK: else:
; CHECK-NEXT: [[ELSE_CMP_DST_LOWER:%.*]] = icmp uge ptr [[DST]], [[LOWER]]
; CHECK-NEXT: [[ELSE_CMP_DST_UPPER:%.*]] = icmp ult ptr [[DST]], [[UPPER]]
; CHECK-NEXT: [[ELSE_RES_1:%.*]] = xor i1 [[ELSE_CMP_DST_LOWER]], [[ELSE_CMP_DST_UPPER]]
; CHECK-NEXT: [[ELSE_DST_SUB_3:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 -3
; CHECK-NEXT: [[ELSE_CMP_DST_SUB_3_LOWER:%.*]] = icmp uge ptr [[ELSE_DST_SUB_3]], [[LOWER]]
; CHECK-NEXT: [[ELSE_CMP_DST_SUB_3_UPPER:%.*]] = icmp ult ptr [[ELSE_DST_SUB_3]], [[UPPER]]
; CHECK-NEXT: [[ELSE_RES_2:%.*]] = xor i1 [[ELSE_RES_1]], [[ELSE_CMP_DST_SUB_3_LOWER]]
; CHECK-NEXT: [[ELSE_RES_3:%.*]] = xor i1 [[ELSE_RES_2]], [[ELSE_CMP_DST_SUB_3_UPPER]]
; CHECK-NEXT: [[ELSE_CMP_DST_SUB_4_LOWER:%.*]] = icmp uge ptr [[DST_SUB_4]], [[LOWER]]
; CHECK-NEXT: [[ELSE_CMP_DST_SUB_4_UPPER:%.*]] = icmp ult ptr [[DST_SUB_4]], [[UPPER]]
; CHECK-NEXT: [[ELSE_RES_4:%.*]] = xor i1 [[ELSE_RES_3]], [[ELSE_CMP_DST_SUB_4_LOWER]]
; CHECK-NEXT: [[ELSE_RES_5:%.*]] = xor i1 [[ELSE_RES_4]], [[ELSE_CMP_DST_SUB_4_UPPER]]
; CHECK-NEXT: [[ELSE_DST_SUB_5:%.*]] = getelementptr inbounds i8, ptr [[DST]], i64 -5
; CHECK-NEXT: [[ELSE_CMP_DST_SUB_5_LOWER:%.*]] = icmp uge ptr [[ELSE_DST_SUB_5]], [[LOWER]]
; CHECK-NEXT: [[ELSE_CMP_DST_SUB_5_UPPER:%.*]] = icmp ult ptr [[ELSE_DST_SUB_5]], [[UPPER]]
; CHECK-NEXT: [[ELSE_RES_6:%.*]] = xor i1 [[ELSE_RES_5]], [[ELSE_CMP_DST_SUB_5_LOWER]]
; CHECK-NEXT: [[ELSE_RES_7:%.*]] = xor i1 [[ELSE_RES_6]], [[ELSE_CMP_DST_SUB_5_UPPER]]
; CHECK-NEXT: ret i1 [[ELSE_RES_7]]
;
%dst.sub.4 = getelementptr inbounds i8, ptr %dst, i64 -4
%pre.dst.lower = icmp uge ptr %dst, %lower
%pre.dst.upper = icmp ult ptr %dst.sub.4, %upper
%and = and i1 %pre.dst.lower, %pre.dst.upper
br i1 %and, label %then, label %else
then:
%cmp.dst.lower = icmp uge ptr %dst, %lower
%cmp.dst.upper = icmp ult ptr %dst, %upper
%res.1 = xor i1 %cmp.dst.lower, %cmp.dst.upper
%dst.sub.3 = getelementptr inbounds i8, ptr %dst, i64 -3
%cmp.dst.sub.3.lower = icmp uge ptr %dst.sub.3, %lower
%cmp.dst.sub.3.upper = icmp ult ptr %dst.sub.3, %upper
%res.2 = xor i1 %res.1, %cmp.dst.sub.3.lower
%res.3 = xor i1 %res.2, %cmp.dst.sub.3.upper
%cmp.dst.sub.4.lower = icmp uge ptr %dst.sub.4, %lower
%cmp.dst.sub.4.upper = icmp ult ptr %dst.sub.4, %upper
%res.4 = xor i1 %res.3, %cmp.dst.sub.4.lower
%res.5 = xor i1 %res.4, %cmp.dst.sub.4.upper
%dst.sub.5 = getelementptr inbounds i8, ptr %dst, i64 -5
%cmp.dst.sub.5.lower = icmp uge ptr %dst.sub.5, %lower
%cmp.dst.sub.5.upper = icmp ult ptr %dst.sub.5, %upper
%res.6 = xor i1 %res.5, %cmp.dst.sub.5.lower
%res.7 = xor i1 %res.6, %cmp.dst.sub.5.upper
ret i1 %res.7
else:
%else.cmp.dst.lower = icmp uge ptr %dst, %lower
%else.cmp.dst.upper = icmp ult ptr %dst, %upper
%else.res.1 = xor i1 %else.cmp.dst.lower, %else.cmp.dst.upper
%else.dst.sub.3 = getelementptr inbounds i8, ptr %dst, i64 -3
%else.cmp.dst.sub.3.lower = icmp uge ptr %else.dst.sub.3, %lower
%else.cmp.dst.sub.3.upper = icmp ult ptr %else.dst.sub.3, %upper
%else.res.2 = xor i1 %else.res.1, %else.cmp.dst.sub.3.lower
%else.res.3 = xor i1 %else.res.2, %else.cmp.dst.sub.3.upper
%else.cmp.dst.sub.4.lower = icmp uge ptr %dst.sub.4, %lower
%else.cmp.dst.sub.4.upper = icmp ult ptr %dst.sub.4, %upper
%else.res.4 = xor i1 %else.res.3, %else.cmp.dst.sub.4.lower
%else.res.5 = xor i1 %else.res.4, %else.cmp.dst.sub.4.upper
%else.dst.sub.5 = getelementptr inbounds i8, ptr %dst, i64 -5
%else.cmp.dst.sub.5.lower = icmp uge ptr %else.dst.sub.5, %lower
%else.cmp.dst.sub.5.upper = icmp ult ptr %else.dst.sub.5, %upper
%else.res.6 = xor i1 %else.res.5, %else.cmp.dst.sub.5.lower
%else.res.7 = xor i1 %else.res.6, %else.cmp.dst.sub.5.upper
ret i1 %else.res.7
}
define i4 @ptr_N_signed_positive_explicit_check_constant_step(ptr %src, ptr %lower, ptr %upper, i16 %N) {
; CHECK-LABEL: @ptr_N_signed_positive_explicit_check_constant_step(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[N_POS:%.*]] = icmp sge i16 [[N:%.*]], 0
; CHECK-NEXT: br i1 [[N_POS]], label [[ENTRY_1:%.*]], label [[TRAP_BB:%.*]]
; CHECK: entry.1:
; CHECK-NEXT: [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i16 [[N]]
; CHECK-NEXT: [[CMP_SRC_START:%.*]] = icmp ult ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT: [[CMP_SRC_END:%.*]] = icmp uge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT: [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT: br i1 [[OR_PRECOND_0]], label [[TRAP_BB]], label [[STEP_CHECK:%.*]]
; CHECK: trap.bb:
; CHECK-NEXT: ret i4 2
; CHECK: step.check:
; CHECK-NEXT: [[STEP_ULT_N:%.*]] = icmp ult i16 1, [[N]]
; CHECK-NEXT: br i1 [[STEP_ULT_N]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK: ptr.check:
; CHECK-NEXT: [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i16 1
; CHECK-NEXT: [[OR_CHECK:%.*]] = or i1 false, false
; CHECK-NEXT: br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i4 3
;
entry:
%N.pos = icmp sge i16 %N, 0
br i1 %N.pos, label %entry.1, label %trap.bb
entry.1:
%src.end = getelementptr inbounds i8, ptr %src, i16 %N
%cmp.src.start = icmp ult ptr %src, %lower
%cmp.src.end = icmp uge ptr %src.end, %upper
%or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
br i1 %or.precond.0, label %trap.bb, label %step.check
trap.bb:
ret i4 2
step.check:
%step.ult.N = icmp ult i16 1, %N
br i1 %step.ult.N, label %ptr.check, label %exit
ptr.check:
%src.step = getelementptr inbounds i8, ptr %src, i16 1
%cmp.step.start = icmp ult ptr %src.step, %lower
%cmp.step.end = icmp uge ptr %src.step, %upper
%or.check = or i1 %cmp.step.start, %cmp.step.end
br i1 %or.check, label %trap.bb, label %exit
exit:
ret i4 3
}
; Same as ptr_N_signed_positive_explicit_check_constant_step, but without inbounds.
define i4 @ptr_N_signed_positive_explicit_check_constant_step_no_inbonds(ptr %src, ptr %lower, ptr %upper, i16 %N) {
; CHECK-LABEL: @ptr_N_signed_positive_explicit_check_constant_step_no_inbonds(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[N_POS:%.*]] = icmp sge i16 [[N:%.*]], 0
; CHECK-NEXT: br i1 [[N_POS]], label [[ENTRY_1:%.*]], label [[TRAP_BB:%.*]]
; CHECK: entry.1:
; CHECK-NEXT: [[SRC_END:%.*]] = getelementptr i8, ptr [[SRC:%.*]], i16 [[N]]
; CHECK-NEXT: [[CMP_SRC_START:%.*]] = icmp ult ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT: [[CMP_SRC_END:%.*]] = icmp uge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT: [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT: br i1 [[OR_PRECOND_0]], label [[TRAP_BB]], label [[STEP_CHECK:%.*]]
; CHECK: trap.bb:
; CHECK-NEXT: ret i4 2
; CHECK: step.check:
; CHECK-NEXT: [[STEP_ULT_N:%.*]] = icmp ult i16 1, [[N]]
; CHECK-NEXT: br i1 [[STEP_ULT_N]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK: ptr.check:
; CHECK-NEXT: [[SRC_STEP:%.*]] = getelementptr i8, ptr [[SRC]], i16 1
; CHECK-NEXT: [[CMP_STEP_START:%.*]] = icmp ult ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT: [[CMP_STEP_END:%.*]] = icmp uge ptr [[SRC_STEP]], [[UPPER]]
; CHECK-NEXT: [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT: br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i4 3
;
entry:
%N.pos = icmp sge i16 %N, 0
br i1 %N.pos, label %entry.1, label %trap.bb
entry.1:
%src.end = getelementptr i8, ptr %src, i16 %N
%cmp.src.start = icmp ult ptr %src, %lower
%cmp.src.end = icmp uge ptr %src.end, %upper
%or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
br i1 %or.precond.0, label %trap.bb, label %step.check
trap.bb:
ret i4 2
step.check:
%step.ult.N = icmp ult i16 1, %N
br i1 %step.ult.N, label %ptr.check, label %exit
ptr.check:
%src.step = getelementptr i8, ptr %src, i16 1
%cmp.step.start = icmp ult ptr %src.step, %lower
%cmp.step.end = icmp uge ptr %src.step, %upper
%or.check = or i1 %cmp.step.start, %cmp.step.end
br i1 %or.check, label %trap.bb, label %exit
exit:
ret i4 3
}
define i4 @ptr_N_and_step_signed_positive_explicit_check_constant_step(ptr %src, ptr %lower, ptr %upper, i16 %N, i16 %step) {
; CHECK-LABEL: @ptr_N_and_step_signed_positive_explicit_check_constant_step(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[N_POS:%.*]] = icmp sge i16 [[N:%.*]], 0
; CHECK-NEXT: [[STEP_POS:%.*]] = icmp sge i16 [[STEP:%.*]], 0
; CHECK-NEXT: [[AND_1:%.*]] = and i1 [[N_POS]], [[STEP_POS]]
; CHECK-NEXT: br i1 [[AND_1]], label [[ENTRY_1:%.*]], label [[TRAP_BB:%.*]]
; CHECK: entry.1:
; CHECK-NEXT: [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i16 [[N]]
; CHECK-NEXT: [[CMP_SRC_START:%.*]] = icmp ult ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT: [[CMP_SRC_END:%.*]] = icmp uge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT: [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT: br i1 [[OR_PRECOND_0]], label [[TRAP_BB]], label [[STEP_CHECK:%.*]]
; CHECK: trap.bb:
; CHECK-NEXT: ret i4 2
; CHECK: step.check:
; CHECK-NEXT: [[STEP_ULT_N:%.*]] = icmp ult i16 [[STEP]], [[N]]
; CHECK-NEXT: [[AND_2:%.*]] = and i1 true, [[STEP_ULT_N]]
; CHECK-NEXT: br i1 [[AND_2]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK: ptr.check:
; CHECK-NEXT: [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i16 1
; CHECK-NEXT: [[OR_CHECK:%.*]] = or i1 false, false
; CHECK-NEXT: br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i4 3
;
entry:
%N.pos = icmp sge i16 %N, 0
%step.pos = icmp sge i16 %step, 0
%and.1 = and i1 %N.pos, %step.pos
br i1 %and.1, label %entry.1, label %trap.bb
entry.1:
%src.end = getelementptr inbounds i8, ptr %src, i16 %N
%cmp.src.start = icmp ult ptr %src, %lower
%cmp.src.end = icmp uge ptr %src.end, %upper
%or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
br i1 %or.precond.0, label %trap.bb, label %step.check
trap.bb:
ret i4 2
step.check:
%step.uge.0 = icmp uge i16 %step, 0
%step.ult.N = icmp ult i16 %step, %N
%and.2 = and i1 %step.uge.0, %step.ult.N
br i1 %and.2, label %ptr.check, label %exit
ptr.check:
%src.step = getelementptr inbounds i8, ptr %src, i16 1
%cmp.step.start = icmp ult ptr %src.step, %lower
%cmp.step.end = icmp uge ptr %src.step, %upper
%or.check = or i1 %cmp.step.start, %cmp.step.end
br i1 %or.check, label %trap.bb, label %exit
exit:
ret i4 3
}
define i4 @ptr_N_and_step_signed_positive_unsigned_checks_only(ptr %src, ptr %lower, ptr %upper, i16 %N, i16 %step) {
; CHECK-LABEL: @ptr_N_and_step_signed_positive_unsigned_checks_only(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i16 [[N:%.*]]
; CHECK-NEXT: [[NO_OVERFLOW:%.*]] = icmp ule ptr [[SRC]], [[SRC_END]]
; CHECK-NEXT: br i1 [[NO_OVERFLOW]], label [[ENTRY_1:%.*]], label [[TRAP_BB:%.*]]
; CHECK: entry.1:
; CHECK-NEXT: [[CMP_SRC_START:%.*]] = icmp ult ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT: [[CMP_SRC_END:%.*]] = icmp uge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT: [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT: br i1 [[OR_PRECOND_0]], label [[TRAP_BB]], label [[STEP_CHECK:%.*]]
; CHECK: trap.bb:
; CHECK-NEXT: ret i4 2
; CHECK: step.check:
; CHECK-NEXT: [[STEP_ULT_N:%.*]] = icmp ult i16 [[STEP:%.*]], [[N]]
; CHECK-NEXT: [[AND_2:%.*]] = and i1 true, [[STEP_ULT_N]]
; CHECK-NEXT: br i1 [[AND_2]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK: ptr.check:
; CHECK-NEXT: [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i16 1
; CHECK-NEXT: [[CMP_STEP_END:%.*]] = icmp uge ptr [[SRC_STEP]], [[UPPER]]
; CHECK-NEXT: [[OR_CHECK:%.*]] = or i1 false, [[CMP_STEP_END]]
; CHECK-NEXT: br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i4 3
;
entry:
%src.end = getelementptr inbounds i8, ptr %src, i16 %N
%no.overflow = icmp ule ptr %src, %src.end
br i1 %no.overflow, label %entry.1, label %trap.bb
entry.1:
%cmp.src.start = icmp ult ptr %src, %lower
%cmp.src.end = icmp uge ptr %src.end, %upper
%or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
br i1 %or.precond.0, label %trap.bb, label %step.check
trap.bb:
ret i4 2
step.check:
%step.uge.0 = icmp uge i16 %step, 0
%step.ult.N = icmp ult i16 %step, %N
%and.2 = and i1 %step.uge.0, %step.ult.N
br i1 %and.2, label %ptr.check, label %exit
ptr.check:
%src.step = getelementptr inbounds i8, ptr %src, i16 1
%cmp.step.start = icmp ult ptr %src.step, %lower
%cmp.step.end = icmp uge ptr %src.step, %upper
%or.check = or i1 %cmp.step.start, %cmp.step.end
br i1 %or.check, label %trap.bb, label %exit
exit:
ret i4 3
}
define i4 @ptr_N_signed_positive(ptr %src, ptr %lower, ptr %upper, i16 %N, i16 %step) {
; CHECK-LABEL: @ptr_N_signed_positive(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i16 [[N:%.*]]
; CHECK-NEXT: [[CMP_SRC_START:%.*]] = icmp ult ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT: [[CMP_SRC_END:%.*]] = icmp uge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT: [[N_NEG:%.*]] = icmp slt i16 [[N]], 0
; CHECK-NEXT: [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT: [[OR_PRECOND_1:%.*]] = or i1 [[OR_PRECOND_0]], [[N_NEG]]
; CHECK-NEXT: br i1 [[OR_PRECOND_1]], label [[TRAP_BB:%.*]], label [[STEP_CHECK:%.*]]
; CHECK: trap.bb:
; CHECK-NEXT: ret i4 2
; CHECK: step.check:
; CHECK-NEXT: [[STEP_ULT_N:%.*]] = icmp ult i16 [[STEP:%.*]], [[N]]
; CHECK-NEXT: [[AND_STEP:%.*]] = and i1 true, [[STEP_ULT_N]]
; CHECK-NEXT: br i1 [[AND_STEP]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK: ptr.check:
; CHECK-NEXT: [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i16 [[STEP]]
; CHECK-NEXT: [[OR_CHECK:%.*]] = or i1 false, false
; CHECK-NEXT: br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i4 3
;
entry:
%src.end = getelementptr inbounds i8, ptr %src, i16 %N
%cmp.src.start = icmp ult ptr %src, %lower
%cmp.src.end = icmp uge ptr %src.end, %upper
%N.neg = icmp slt i16 %N, 0
%or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
%or.precond.1 = or i1 %or.precond.0, %N.neg
br i1 %or.precond.1, label %trap.bb, label %step.check
trap.bb:
ret i4 2
step.check:
%step.pos = icmp uge i16 %step, 0
%step.ult.N = icmp ult i16 %step, %N
%and.step = and i1 %step.pos, %step.ult.N
br i1 %and.step, label %ptr.check, label %exit
ptr.check:
%src.step = getelementptr inbounds i8, ptr %src, i16 %step
%cmp.step.start = icmp ult ptr %src.step, %lower
%cmp.step.end = icmp uge ptr %src.step, %upper
%or.check = or i1 %cmp.step.start, %cmp.step.end
br i1 %or.check, label %trap.bb, label %exit
exit:
ret i4 3
}
define i4 @ptr_N_could_be_negative(ptr %src, ptr %lower, ptr %upper, i8 %N, i8 %step) {
; CHECK-LABEL: @ptr_N_could_be_negative(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i8 [[N:%.*]]
; CHECK-NEXT: [[CMP_SRC_START:%.*]] = icmp ult ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT: [[CMP_SRC_END:%.*]] = icmp uge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT: [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT: br i1 [[OR_PRECOND_0]], label [[TRAP_BB:%.*]], label [[STEP_CHECK:%.*]]
; CHECK: trap.bb:
; CHECK-NEXT: ret i4 2
; CHECK: step.check:
; CHECK-NEXT: [[STEP_ULT_N:%.*]] = icmp ult i8 [[STEP:%.*]], [[N]]
; CHECK-NEXT: [[AND_STEP:%.*]] = and i1 true, [[STEP_ULT_N]]
; CHECK-NEXT: br i1 [[AND_STEP]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK: ptr.check:
; CHECK-NEXT: [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i8 [[STEP]]
; CHECK-NEXT: [[CMP_STEP_START:%.*]] = icmp ult ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT: [[CMP_STEP_END:%.*]] = icmp uge ptr [[SRC_STEP]], [[UPPER]]
; CHECK-NEXT: [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT: br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i4 3
;
entry:
%src.end = getelementptr inbounds i8, ptr %src, i8 %N
%cmp.src.start = icmp ult ptr %src, %lower
%cmp.src.end = icmp uge ptr %src.end, %upper
%or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
br i1 %or.precond.0, label %trap.bb, label %step.check
trap.bb:
ret i4 2
step.check:
%step.pos = icmp uge i8 %step, 0
%step.ult.N = icmp ult i8 %step, %N
%and.step = and i1 %step.pos, %step.ult.N
br i1 %and.step, label %ptr.check, label %exit
ptr.check:
%src.step = getelementptr inbounds i8, ptr %src, i8 %step
%cmp.step.start = icmp ult ptr %src.step, %lower
%cmp.step.end = icmp uge ptr %src.step, %upper
%or.check = or i1 %cmp.step.start, %cmp.step.end
br i1 %or.check, label %trap.bb, label %exit
exit:
ret i4 3
}
define i4 @ptr_src_uge_end(ptr %src, ptr %lower, ptr %upper, i8 %N, i8 %step) {
; CHECK-LABEL: @ptr_src_uge_end(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i8 [[N:%.*]]
; CHECK-NEXT: [[CMP_SRC_START:%.*]] = icmp ult ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT: [[CMP_SRC_END:%.*]] = icmp uge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT: [[CMP_OVERFLOW:%.*]] = icmp ugt ptr [[SRC]], [[SRC_END]]
; CHECK-NEXT: [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT: [[OR_PRECOND_1:%.*]] = or i1 [[OR_PRECOND_0]], [[CMP_OVERFLOW]]
; CHECK-NEXT: br i1 [[OR_PRECOND_1]], label [[TRAP_BB:%.*]], label [[STEP_CHECK:%.*]]
; CHECK: trap.bb:
; CHECK-NEXT: ret i4 2
; CHECK: step.check:
; CHECK-NEXT: [[STEP_ULT_N:%.*]] = icmp ult i8 [[STEP:%.*]], [[N]]
; CHECK-NEXT: [[AND_STEP:%.*]] = and i1 true, [[STEP_ULT_N]]
; CHECK-NEXT: br i1 [[AND_STEP]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK: ptr.check:
; CHECK-NEXT: [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i8 [[STEP]]
; CHECK-NEXT: [[CMP_STEP_START:%.*]] = icmp ult ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT: [[CMP_STEP_END:%.*]] = icmp uge ptr [[SRC_STEP]], [[UPPER]]
; CHECK-NEXT: [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT: br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i4 3
;
entry:
%src.end = getelementptr inbounds i8, ptr %src, i8 %N
%cmp.src.start = icmp ult ptr %src, %lower
%cmp.src.end = icmp uge ptr %src.end, %upper
%cmp.overflow = icmp ugt ptr %src, %src.end
%or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
%or.precond.1 = or i1 %or.precond.0, %cmp.overflow
br i1 %or.precond.1, label %trap.bb, label %step.check
trap.bb:
ret i4 2
step.check:
%step.pos = icmp uge i8 %step, 0
%step.ult.N = icmp ult i8 %step, %N
%and.step = and i1 %step.pos, %step.ult.N
br i1 %and.step, label %ptr.check, label %exit
ptr.check:
%src.step = getelementptr inbounds i8, ptr %src, i8 %step
%cmp.step.start = icmp ult ptr %src.step, %lower
%cmp.step.end = icmp uge ptr %src.step, %upper
%or.check = or i1 %cmp.step.start, %cmp.step.end
br i1 %or.check, label %trap.bb, label %exit
exit:
ret i4 3
}
; N might be negative, meaning %src.end could be < %src! Cannot remove checks!
define i4 @ptr_N_unsigned_positive(ptr %src, ptr %lower, ptr %upper, i16 %N, i16 %step) {
; CHECK-LABEL: @ptr_N_unsigned_positive(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i16 [[N:%.*]]
; CHECK-NEXT: [[CMP_SRC_START:%.*]] = icmp ult ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT: [[CMP_SRC_END:%.*]] = icmp uge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT: [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT: [[OR_PRECOND_1:%.*]] = or i1 [[OR_PRECOND_0]], false
; CHECK-NEXT: br i1 [[OR_PRECOND_1]], label [[TRAP_BB:%.*]], label [[STEP_CHECK:%.*]]
; CHECK: trap.bb:
; CHECK-NEXT: ret i4 2
; CHECK: step.check:
; CHECK-NEXT: [[STEP_ULT_N:%.*]] = icmp ult i16 [[STEP:%.*]], [[N]]
; CHECK-NEXT: [[AND_STEP:%.*]] = and i1 true, [[STEP_ULT_N]]
; CHECK-NEXT: br i1 [[AND_STEP]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK: ptr.check:
; CHECK-NEXT: [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i16 [[STEP]]
; CHECK-NEXT: [[CMP_STEP_START:%.*]] = icmp ult ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT: [[CMP_STEP_END:%.*]] = icmp uge ptr [[SRC_STEP]], [[UPPER]]
; CHECK-NEXT: [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT: br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i4 3
;
entry:
%src.end = getelementptr inbounds i8, ptr %src, i16 %N
%cmp.src.start = icmp ult ptr %src, %lower
%cmp.src.end = icmp uge ptr %src.end, %upper
%N.neg = icmp ult i16 %N, 0
%or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
%or.precond.1 = or i1 %or.precond.0, %N.neg
br i1 %or.precond.1, label %trap.bb, label %step.check
trap.bb:
ret i4 2
step.check:
%step.pos = icmp uge i16 %step, 0
%step.ult.N = icmp ult i16 %step, %N
%and.step = and i1 %step.pos, %step.ult.N
br i1 %and.step, label %ptr.check, label %exit
ptr.check:
%src.step = getelementptr inbounds i8, ptr %src, i16 %step
%cmp.step.start = icmp ult ptr %src.step, %lower
%cmp.step.end = icmp uge ptr %src.step, %upper
%or.check = or i1 %cmp.step.start, %cmp.step.end
br i1 %or.check, label %trap.bb, label %exit
exit:
ret i4 3
}
define i4 @ptr_N_signed_positive_assume(ptr %src, ptr %lower, ptr %upper, i16 %N, i16 %step) {
; CHECK-LABEL: @ptr_N_signed_positive_assume(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[SRC_END:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i16 [[N:%.*]]
; CHECK-NEXT: [[CMP_SRC_START:%.*]] = icmp ult ptr [[SRC]], [[LOWER:%.*]]
; CHECK-NEXT: [[CMP_SRC_END:%.*]] = icmp uge ptr [[SRC_END]], [[UPPER:%.*]]
; CHECK-NEXT: [[N_NEG:%.*]] = icmp slt i16 [[N]], 0
; CHECK-NEXT: call void @llvm.assume(i1 [[N_NEG]])
; CHECK-NEXT: [[OR_PRECOND_0:%.*]] = or i1 [[CMP_SRC_START]], [[CMP_SRC_END]]
; CHECK-NEXT: br i1 [[OR_PRECOND_0]], label [[TRAP_BB:%.*]], label [[STEP_CHECK:%.*]]
; CHECK: trap.bb:
; CHECK-NEXT: ret i4 2
; CHECK: step.check:
; CHECK-NEXT: [[STEP_ULT_N:%.*]] = icmp ult i16 [[STEP:%.*]], [[N]]
; CHECK-NEXT: [[AND_STEP:%.*]] = and i1 true, [[STEP_ULT_N]]
; CHECK-NEXT: br i1 [[AND_STEP]], label [[PTR_CHECK:%.*]], label [[EXIT:%.*]]
; CHECK: ptr.check:
; CHECK-NEXT: [[SRC_STEP:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i16 [[STEP]]
; CHECK-NEXT: [[CMP_STEP_START:%.*]] = icmp ult ptr [[SRC_STEP]], [[LOWER]]
; CHECK-NEXT: [[CMP_STEP_END:%.*]] = icmp uge ptr [[SRC_STEP]], [[UPPER]]
; CHECK-NEXT: [[OR_CHECK:%.*]] = or i1 [[CMP_STEP_START]], [[CMP_STEP_END]]
; CHECK-NEXT: br i1 [[OR_CHECK]], label [[TRAP_BB]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret i4 3
;
entry:
%src.end = getelementptr inbounds i8, ptr %src, i16 %N
%cmp.src.start = icmp ult ptr %src, %lower
%cmp.src.end = icmp uge ptr %src.end, %upper
%N.neg = icmp slt i16 %N, 0
call void @llvm.assume(i1 %N.neg)
%or.precond.0 = or i1 %cmp.src.start, %cmp.src.end
br i1 %or.precond.0, label %trap.bb, label %step.check
trap.bb:
ret i4 2
step.check:
%step.pos = icmp uge i16 %step, 0
%step.ult.N = icmp ult i16 %step, %N
%and.step = and i1 %step.pos, %step.ult.N
br i1 %and.step, label %ptr.check, label %exit
ptr.check:
%src.step = getelementptr inbounds i8, ptr %src, i16 %step
%cmp.step.start = icmp ult ptr %src.step, %lower
%cmp.step.end = icmp uge ptr %src.step, %upper
%or.check = or i1 %cmp.step.start, %cmp.step.end
br i1 %or.check, label %trap.bb, label %exit
exit:
ret i4 3
}
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