derek.holloway
7502bf64a4
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88 lines
3.4 KiB
LLVM
88 lines
3.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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declare void @use(i32) readonly
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; We prefer to canonicalize the machine width gep indices early
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define void @test(ptr %p, i32 %index) {
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; CHECK-LABEL: define void @test(
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; CHECK-SAME: ptr [[P:%.*]], i32 [[INDEX:%.*]]) {
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; CHECK-NEXT: [[TMP1:%.*]] = sext i32 [[INDEX]] to i64
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; CHECK-NEXT: [[ADDR:%.*]] = getelementptr [4 x i8], ptr [[P]], i64 [[TMP1]]
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; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[ADDR]], align 4
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; CHECK-NEXT: call void @use(i32 [[VAL]])
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; CHECK-NEXT: ret void
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;
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%addr = getelementptr i32, ptr %p, i32 %index
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%val = load i32, ptr %addr
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call void @use(i32 %val)
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ret void
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}
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; If they've already been canonicalized via zext, that's fine
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define void @test2(ptr %p, i32 %index) {
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; CHECK-LABEL: define void @test2(
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; CHECK-SAME: ptr [[P:%.*]], i32 [[INDEX:%.*]]) {
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; CHECK-NEXT: [[I:%.*]] = zext i32 [[INDEX]] to i64
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; CHECK-NEXT: [[ADDR:%.*]] = getelementptr [4 x i8], ptr [[P]], i64 [[I]]
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; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[ADDR]], align 4
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; CHECK-NEXT: call void @use(i32 [[VAL]])
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; CHECK-NEXT: ret void
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;
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%i = zext i32 %index to i64
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%addr = getelementptr i32, ptr %p, i64 %i
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%val = load i32, ptr %addr
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call void @use(i32 %val)
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ret void
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}
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; If we can use a zext, we prefer that. This requires
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; knowing that the index is positive.
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define void @test3(ptr %p, i32 %index) {
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; CHECK-LABEL: define void @test3(
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; CHECK-SAME: ptr [[P:%.*]], i32 [[INDEX:%.*]]) {
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; CHECK-NEXT: [[ADDR_BEGIN:%.*]] = getelementptr i8, ptr [[P]], i64 160
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; CHECK-NEXT: [[ADDR_FIXED:%.*]] = getelementptr i8, ptr [[P]], i64 352
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; CHECK-NEXT: [[VAL_FIXED:%.*]] = load i32, ptr [[ADDR_FIXED]], align 4, !range [[RNG0:![0-9]+]]
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; CHECK-NEXT: [[TMP1:%.*]] = zext nneg i32 [[VAL_FIXED]] to i64
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; CHECK-NEXT: [[ADDR:%.*]] = getelementptr [4 x i8], ptr [[ADDR_BEGIN]], i64 [[TMP1]]
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; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[ADDR]], align 4
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; CHECK-NEXT: call void @use(i32 [[VAL]])
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; CHECK-NEXT: ret void
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;
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%addr_begin = getelementptr i32, ptr %p, i64 40
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%addr_fixed = getelementptr i32, ptr %addr_begin, i64 48
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%val_fixed = load i32, ptr %addr_fixed, !range !0
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%addr = getelementptr i32, ptr %addr_begin, i32 %val_fixed
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%val = load i32, ptr %addr
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call void @use(i32 %val)
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ret void
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}
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; Replace sext with zext where possible
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define void @test4(ptr %p, i32 %index) {
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; CHECK-LABEL: define void @test4(
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; CHECK-SAME: ptr [[P:%.*]], i32 [[INDEX:%.*]]) {
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; CHECK-NEXT: [[ADDR_BEGIN:%.*]] = getelementptr i8, ptr [[P]], i64 160
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; CHECK-NEXT: [[ADDR_FIXED:%.*]] = getelementptr i8, ptr [[P]], i64 352
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; CHECK-NEXT: [[VAL_FIXED:%.*]] = load i32, ptr [[ADDR_FIXED]], align 4, !range [[RNG0]]
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; CHECK-NEXT: [[I:%.*]] = zext nneg i32 [[VAL_FIXED]] to i64
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; CHECK-NEXT: [[ADDR:%.*]] = getelementptr [4 x i8], ptr [[ADDR_BEGIN]], i64 [[I]]
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; CHECK-NEXT: [[VAL:%.*]] = load i32, ptr [[ADDR]], align 4
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; CHECK-NEXT: call void @use(i32 [[VAL]])
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; CHECK-NEXT: ret void
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;
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%addr_begin = getelementptr i32, ptr %p, i64 40
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%addr_fixed = getelementptr i32, ptr %addr_begin, i64 48
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%val_fixed = load i32, ptr %addr_fixed, !range !0
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%i = sext i32 %val_fixed to i64
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%addr = getelementptr i32, ptr %addr_begin, i64 %i
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%val = load i32, ptr %addr
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call void @use(i32 %val)
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ret void
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}
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;; !range !0
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!0 = !{i32 0, i32 2147483647}
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;.
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; CHECK: [[RNG0]] = !{i32 0, i32 2147483647}
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;.
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