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[InstCombine] Fold IntToPtr and PtrToInt into preceding loads.
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
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,79 @@ | ||
; RUN: opt -instcombine -S < %s | FileCheck %s | ||
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target datalayout = "p:32:32:32" | ||
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define i64* @test1(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test1( | ||
; CHECK: load i64, i64* | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i64* | ||
%b = load i64, i64* %a | ||
%c = inttoptr i64 %b to i64* | ||
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ret i64* %c | ||
} | ||
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define i32* @test2(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test2( | ||
; CHECK: load i32*, i32** | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i32* | ||
%b = load i32, i32* %a | ||
%c = inttoptr i32 %b to i32* | ||
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ret i32* %c | ||
} | ||
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define i64* @test3(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test3( | ||
; CHECK: load i64*, i64** | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i32* | ||
%b = load i32, i32* %a | ||
%c = inttoptr i32 %b to i64* | ||
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ret i64* %c | ||
} | ||
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define i64 @test4(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test4( | ||
; CHECK: load i32, i32* | ||
; CHECK: zext | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i64** | ||
%b = load i64*, i64** %a | ||
%c = ptrtoint i64* %b to i64 | ||
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ret i64 %c | ||
} | ||
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define i32 @test5(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test5( | ||
; CHECK: load i32, i32* | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i32** | ||
%b = load i32*, i32** %a | ||
%c = ptrtoint i32* %b to i32 | ||
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ret i32 %c | ||
} | ||
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define i64 @test6(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test6( | ||
; CHECK: load i32, i32* | ||
; CHECK: zext | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i32** | ||
%b = load i32*, i32** %a | ||
%c = ptrtoint i32* %b to i64 | ||
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ret i64 %c | ||
} | ||
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,78 @@ | ||
; 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) { | ||
entry: | ||
; CHECK-LABEL: @test1( | ||
; CHECK: load i64*, i64** | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i64* | ||
%b = load i64, i64* %a | ||
%c = inttoptr i64 %b to i64* | ||
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ret i64* %c | ||
} | ||
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define i32* @test2(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test2( | ||
; CHECK: load i32, i32* | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i32* | ||
%b = load i32, i32* %a | ||
%c = inttoptr i32 %b to i32* | ||
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ret i32* %c | ||
} | ||
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define i64* @test3(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test3( | ||
; CHECK: load i32, i32* | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i32* | ||
%b = load i32, i32* %a | ||
%c = inttoptr i32 %b to i64* | ||
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ret i64* %c | ||
} | ||
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define i64 @test4(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test4( | ||
; CHECK: load i64, i64* | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i64** | ||
%b = load i64*, i64** %a | ||
%c = ptrtoint i64* %b to i64 | ||
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ret i64 %c | ||
} | ||
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define i32 @test5(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test5( | ||
; CHECK: load i64, i64* | ||
; CHECK: trunc | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i32** | ||
%b = load i32*, i32** %a | ||
%c = ptrtoint i32* %b to i32 | ||
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ret i32 %c | ||
} | ||
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define i64 @test6(i8* %x) { | ||
entry: | ||
; CHECK-LABEL: @test6( | ||
; CHECK: load i64, i64* | ||
; CHECK: ret | ||
%a = bitcast i8* %x to i32** | ||
%b = load i32*, i32** %a | ||
%c = ptrtoint i32* %b to i64 | ||
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ret i64 %c | ||
} | ||
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