055bfc0271
GEPs are often in the form `gep [N x %T], ptr %p, i64 0, i64 %idx`. Canonicalize these to `gep %T, ptr %p, i64 %idx`. This enables transforms that only support one GEP index to work and improves CSE. Various transforms were recently hardened to make sure they still work without the leading index.
67 lines
3.0 KiB
LLVM
67 lines
3.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt -S -O2 < %s | FileCheck %s
|
|
|
|
; Test a single-iteration loop that should get SROAd once we realize that fact.
|
|
; It should compile down to a bswap.
|
|
|
|
; The helper function exists to avoid IPSCCP breaking the loop too early.
|
|
|
|
define i16 @helper(i16 %0, i64 %x) {
|
|
; CHECK-LABEL: @helper(
|
|
; CHECK-NEXT: start:
|
|
; CHECK-NEXT: [[DATA:%.*]] = alloca [2 x i8], align 2
|
|
; CHECK-NEXT: store i16 [[TMP0:%.*]], ptr [[DATA]], align 2
|
|
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds nuw i8, ptr [[DATA]], i64 1
|
|
; CHECK-NEXT: br label [[BB6_I_I:%.*]]
|
|
; CHECK: bb6.i.i:
|
|
; CHECK-NEXT: [[ITER_SROA_0_07_I_I:%.*]] = phi i64 [ [[TMP2:%.*]], [[BB6_I_I]] ], [ 0, [[START:%.*]] ]
|
|
; CHECK-NEXT: [[_40_I_I:%.*]] = sub nsw i64 0, [[ITER_SROA_0_07_I_I]]
|
|
; CHECK-NEXT: [[TMP2]] = add nuw nsw i64 [[ITER_SROA_0_07_I_I]], 1
|
|
; CHECK-NEXT: [[_34_I_I:%.*]] = getelementptr inbounds nuw i8, ptr [[DATA]], i64 [[ITER_SROA_0_07_I_I]]
|
|
; CHECK-NEXT: [[_39_I_I:%.*]] = getelementptr inbounds i8, ptr [[TMP1]], i64 [[_40_I_I]]
|
|
; CHECK-NEXT: [[TMP_0_COPYLOAD_I_I_I_I:%.*]] = load i8, ptr [[_34_I_I]], align 1
|
|
; CHECK-NEXT: [[TMP2_0_COPYLOAD_I_I_I_I:%.*]] = load i8, ptr [[_39_I_I]], align 1
|
|
; CHECK-NEXT: store i8 [[TMP2_0_COPYLOAD_I_I_I_I]], ptr [[_34_I_I]], align 1
|
|
; CHECK-NEXT: store i8 [[TMP_0_COPYLOAD_I_I_I_I]], ptr [[_39_I_I]], align 1
|
|
; CHECK-NEXT: [[EXITCOND_NOT_I_I:%.*]] = icmp eq i64 [[TMP2]], [[X:%.*]]
|
|
; CHECK-NEXT: br i1 [[EXITCOND_NOT_I_I]], label [[EXIT:%.*]], label [[BB6_I_I]]
|
|
; CHECK: exit:
|
|
; CHECK-NEXT: [[DOTSROA_0_0_COPYLOAD:%.*]] = load i16, ptr [[DATA]], align 2
|
|
; CHECK-NEXT: ret i16 [[DOTSROA_0_0_COPYLOAD]]
|
|
;
|
|
start:
|
|
%data = alloca [2 x i8], align 2
|
|
store i16 %0, ptr %data, align 2
|
|
%1 = getelementptr inbounds i8, ptr %data, i64 2
|
|
%2 = getelementptr inbounds i8, ptr %1, i64 -1
|
|
br label %bb6.i.i
|
|
|
|
bb6.i.i:
|
|
%iter.sroa.0.07.i.i = phi i64 [ %4, %bb6.i.i ], [ 0, %start ]
|
|
%3 = xor i64 %iter.sroa.0.07.i.i, -1
|
|
%_40.i.i = add nsw i64 1, %3
|
|
%4 = add nuw nsw i64 %iter.sroa.0.07.i.i, 1
|
|
%_34.i.i = getelementptr inbounds [0 x i8], ptr %data, i64 0, i64 %iter.sroa.0.07.i.i
|
|
%_39.i.i = getelementptr inbounds [0 x i8], ptr %2, i64 0, i64 %_40.i.i
|
|
%tmp.0.copyload.i.i.i.i = load i8, ptr %_34.i.i, align 1
|
|
%tmp2.0.copyload.i.i.i.i = load i8, ptr %_39.i.i, align 1
|
|
store i8 %tmp2.0.copyload.i.i.i.i, ptr %_34.i.i, align 1
|
|
store i8 %tmp.0.copyload.i.i.i.i, ptr %_39.i.i, align 1
|
|
%exitcond.not.i.i = icmp eq i64 %4, %x
|
|
br i1 %exitcond.not.i.i, label %exit, label %bb6.i.i
|
|
|
|
exit:
|
|
%.sroa.0.0.copyload = load i16, ptr %data, align 2
|
|
ret i16 %.sroa.0.0.copyload
|
|
}
|
|
|
|
define i16 @test(i16 %arg) {
|
|
; CHECK-LABEL: @test(
|
|
; CHECK-NEXT: bb6.i.i.i:
|
|
; CHECK-NEXT: [[DATA_I_SROA_0_0_INSERT_INSERT:%.*]] = tail call i16 @llvm.bswap.i16(i16 [[ARG:%.*]])
|
|
; CHECK-NEXT: ret i16 [[DATA_I_SROA_0_0_INSERT_INSERT]]
|
|
;
|
|
%ret = call i16 @helper(i16 %arg, i64 1)
|
|
ret i16 %ret
|
|
}
|