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794d4b6ead
And another step towards transforms not introducing inttoptr and/or ptrtoint casts that weren't there already. As we've been establishing (see D88788/D88789), if there is a int<->ptr cast, it basically must stay as-is, we can't do much with it. I've looked, and the most source of new such casts being introduces, as far as i can tell, is this transform, which, ironically, tries to reduce count of casts.. On vanilla llvm test-suite + RawSpeed, @ `-O3`, this results in -33.58% less `IntToPtr`s (19014 -> 12629) and +76.20% more `PtrToInt`s (18589 -> 32753), which is an increase of +20.69% in total. However just on RawSpeed, where i know there are basically none `IntToPtr` in the original source code, this results in -99.27% less `IntToPtr`s (2724 -> 20) and +82.92% more `PtrToInt`s (4513 -> 8255). which is again an increase of 14.34% in total. To me this does seem like the step in the right direction, we end up with strictly less `IntToPtr`, but strictly more `PtrToInt`, which seems like a reasonable trade-off. See https://reviews.llvm.org/D88860 / https://reviews.llvm.org/D88995 for some more discussion on the subject. (Eventually, `CastInst::isNoopCast()`/`CastInst::isEliminableCastPair` should be taught about this, yes) Reviewed By: nlopes, nikic Differential Revision: https://reviews.llvm.org/D88979
106 lines
2.6 KiB
LLVM
106 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine -S < %s | FileCheck %s
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target datalayout = "p:64:64:64-i64:32:32"
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define i64* @test1(i8* %x) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[A:%.*]] = bitcast i8* [[X:%.*]] to i64*
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; CHECK-NEXT: [[B:%.*]] = load i64, i64* [[A]], align 4
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; CHECK-NEXT: [[C:%.*]] = inttoptr i64 [[B]] to i64*
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; CHECK-NEXT: ret i64* [[C]]
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;
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entry:
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%a = bitcast i8* %x to i64*
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%b = load i64, i64* %a
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%c = inttoptr i64 %b to i64*
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ret i64* %c
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}
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define i32* @test2(i8* %x) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[A:%.*]] = bitcast i8* [[X:%.*]] to i32*
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; CHECK-NEXT: [[B:%.*]] = load i32, i32* [[A]], align 4
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; CHECK-NEXT: [[TMP0:%.*]] = zext i32 [[B]] to i64
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; CHECK-NEXT: [[C:%.*]] = inttoptr i64 [[TMP0]] to i32*
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; CHECK-NEXT: ret i32* [[C]]
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;
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entry:
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%a = bitcast i8* %x to i32*
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%b = load i32, i32* %a
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%c = inttoptr i32 %b to i32*
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ret i32* %c
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}
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define i64* @test3(i8* %x) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[A:%.*]] = bitcast i8* [[X:%.*]] to i32*
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; CHECK-NEXT: [[B:%.*]] = load i32, i32* [[A]], align 4
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; CHECK-NEXT: [[TMP0:%.*]] = zext i32 [[B]] to i64
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; CHECK-NEXT: [[C:%.*]] = inttoptr i64 [[TMP0]] to i64*
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; CHECK-NEXT: ret i64* [[C]]
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;
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entry:
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%a = bitcast i8* %x to i32*
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%b = load i32, i32* %a
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%c = inttoptr i32 %b to i64*
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ret i64* %c
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}
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define i64 @test4(i8* %x) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[A:%.*]] = bitcast i8* [[X:%.*]] to i64**
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; CHECK-NEXT: [[B:%.*]] = load i64*, i64** [[A]], align 8
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; CHECK-NEXT: [[C:%.*]] = ptrtoint i64* [[B]] to i64
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; CHECK-NEXT: ret i64 [[C]]
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;
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entry:
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%a = bitcast i8* %x to i64**
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%b = load i64*, i64** %a
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%c = ptrtoint i64* %b to i64
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ret i64 %c
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}
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define i32 @test5(i8* %x) {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[A:%.*]] = bitcast i8* [[X:%.*]] to i32**
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; CHECK-NEXT: [[B:%.*]] = load i32*, i32** [[A]], align 8
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; CHECK-NEXT: [[TMP0:%.*]] = ptrtoint i32* [[B]] to i64
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; CHECK-NEXT: [[C:%.*]] = trunc i64 [[TMP0]] to i32
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; CHECK-NEXT: ret i32 [[C]]
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;
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entry:
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%a = bitcast i8* %x to i32**
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%b = load i32*, i32** %a
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%c = ptrtoint i32* %b to i32
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ret i32 %c
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}
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define i64 @test6(i8* %x) {
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[A:%.*]] = bitcast i8* [[X:%.*]] to i32**
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; CHECK-NEXT: [[B:%.*]] = load i32*, i32** [[A]], align 8
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; CHECK-NEXT: [[C:%.*]] = ptrtoint i32* [[B]] to i64
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; CHECK-NEXT: ret i64 [[C]]
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;
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entry:
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%a = bitcast i8* %x to i32**
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%b = load i32*, i32** %a
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%c = ptrtoint i32* %b to i64
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ret i64 %c
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}
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