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514ab73614
Currently we only fold a BitCast into a Load when the BitCast is its only user. Do the same for any no-op cast. Differential Revision: http://reviews.llvm.org/D9152 llvm-svn: 238452
79 lines
1.3 KiB
LLVM
79 lines
1.3 KiB
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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target datalayout = "p:64:64:64"
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define i64* @test1(i8* %x) {
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entry:
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; CHECK-LABEL: @test1(
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; CHECK: load i64*, i64**
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; CHECK: ret
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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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entry:
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; CHECK-LABEL: @test2(
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; CHECK: load i32, i32*
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; CHECK: ret
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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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entry:
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; CHECK-LABEL: @test3(
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; CHECK: load i32, i32*
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; CHECK: ret
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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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entry:
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; CHECK-LABEL: @test4(
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; CHECK: load i64, i64*
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; CHECK: ret
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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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entry:
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; CHECK-LABEL: @test5(
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; CHECK: load i64, i64*
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; CHECK: trunc
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; CHECK: ret
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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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entry:
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; CHECK-LABEL: @test6(
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; CHECK: load i64, i64*
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; CHECK: ret
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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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