744a23f24b
If we have something like `(select (icmp ult x, 8), x, y)`, we can use the `(icmp ult x, 8)` to help compute the knownbits of `x`. Closes #84699
82 lines
2.9 KiB
LLVM
82 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=instcombine -S < %s | FileCheck %s
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define i8 @select_condition_implies_highbits_op1(i8 %xx, i8 noundef %y) {
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; CHECK-LABEL: @select_condition_implies_highbits_op1(
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; CHECK-NEXT: [[X:%.*]] = and i8 [[XX:%.*]], 15
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; CHECK-NEXT: [[COND:%.*]] = icmp ult i8 [[Y:%.*]], 3
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[COND]], i8 [[Y]], i8 [[X]]
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; CHECK-NEXT: [[R:%.*]] = or disjoint i8 [[SEL]], 32
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x = and i8 %xx, 15
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%cond = icmp ult i8 %y, 3
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%sel = select i1 %cond, i8 %y, i8 %x
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%r = add i8 %sel, 32
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ret i8 %r
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}
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define i8 @select_condition_implies_highbits_op1_maybe_undef_fail(i8 %xx, i8 %y) {
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; CHECK-LABEL: @select_condition_implies_highbits_op1_maybe_undef_fail(
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; CHECK-NEXT: [[X:%.*]] = and i8 [[XX:%.*]], 15
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; CHECK-NEXT: [[COND:%.*]] = icmp ult i8 [[Y:%.*]], 3
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[COND]], i8 [[Y]], i8 [[X]]
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; CHECK-NEXT: [[R:%.*]] = add i8 [[SEL]], 32
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x = and i8 %xx, 15
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%cond = icmp ult i8 %y, 3
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%sel = select i1 %cond, i8 %y, i8 %x
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%r = add i8 %sel, 32
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ret i8 %r
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}
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define i8 @select_condition_implies_highbits_op2(i8 %xx, i8 noundef %y) {
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; CHECK-LABEL: @select_condition_implies_highbits_op2(
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; CHECK-NEXT: [[X:%.*]] = and i8 [[XX:%.*]], 15
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; CHECK-NEXT: [[COND:%.*]] = icmp ugt i8 [[Y:%.*]], 3
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[COND]], i8 [[X]], i8 [[Y]]
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; CHECK-NEXT: [[R:%.*]] = or disjoint i8 [[SEL]], 32
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x = and i8 %xx, 15
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%cond = icmp ugt i8 %y, 3
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%sel = select i1 %cond, i8 %x, i8 %y
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%r = add i8 %sel, 32
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ret i8 %r
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}
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define i8 @select_condition_implies_highbits_op1_and(i8 %xx, i8 noundef %y, i1 %other_cond) {
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; CHECK-LABEL: @select_condition_implies_highbits_op1_and(
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; CHECK-NEXT: [[X:%.*]] = and i8 [[XX:%.*]], 15
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; CHECK-NEXT: [[COND0:%.*]] = icmp ult i8 [[Y:%.*]], 3
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; CHECK-NEXT: [[COND:%.*]] = and i1 [[COND0]], [[OTHER_COND:%.*]]
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[COND]], i8 [[Y]], i8 [[X]]
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; CHECK-NEXT: [[R:%.*]] = or disjoint i8 [[SEL]], 32
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x = and i8 %xx, 15
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%cond0 = icmp ult i8 %y, 3
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%cond = and i1 %cond0, %other_cond
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%sel = select i1 %cond, i8 %y, i8 %x
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%r = add i8 %sel, 32
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ret i8 %r
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}
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define i8 @select_condition_implies_highbits_op2_or(i8 %xx, i8 noundef %y, i1 %other_cond) {
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; CHECK-LABEL: @select_condition_implies_highbits_op2_or(
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; CHECK-NEXT: [[X:%.*]] = and i8 [[XX:%.*]], 15
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; CHECK-NEXT: [[COND0:%.*]] = icmp ugt i8 [[Y:%.*]], 3
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; CHECK-NEXT: [[COND:%.*]] = or i1 [[COND0]], [[OTHER_COND:%.*]]
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[COND]], i8 [[X]], i8 [[Y]]
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; CHECK-NEXT: [[R:%.*]] = or disjoint i8 [[SEL]], 32
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x = and i8 %xx, 15
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%cond0 = icmp ugt i8 %y, 3
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%cond = or i1 %cond0, %other_cond
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%sel = select i1 %cond, i8 %x, i8 %y
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%r = add i8 %sel, 32
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ret i8 %r
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}
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