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llvm-project/llvm/test/Transforms/InstCombine/load3.ll

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convert to filechecconvert to filecheckk llvm-svn: 108112
2010-07-12 08:21:10 +08:00
; RUN: opt < %s -instcombine -S | FileCheck %s
ConstantFolding: Evaluate GEP indices in the index type. This fixes some edge cases that we would get wrong with uint64_ts. PR14986. llvm-svn: 173289
2013-01-24 04:41:05 +08:00
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32-S128"
target triple = "i386-apple-macosx10.0.0"
Teach instcombine's visitLoad to scan back several instructions to find opportunities for store-to-load forwarding or load CSE, in the same way that visitStore scans back to do DSE. Also, define a new helper function for testing whether the addresses of two memory accesses are known to have the same value, and use it in both visitStore and visitLoad. These two changes allow instcombine to eliminate loads in code produced by front-ends that frequently emit obviously redundant addressing for memory references. llvm-svn: 57608
2008-10-16 07:19:35 +08:00
; Instcombine should be able to do trivial CSE of loads.
convert to filechecconvert to filecheckk llvm-svn: 108112
2010-07-12 08:21:10 +08:00
define i32 @test1(i32* %p) {
%t0 = getelementptr i32* %p, i32 1
%y = load i32* %t0
%t1 = getelementptr i32* %p, i32 1
%x = load i32* %t1
%a = sub i32 %y, %x
ret i32 %a
; CHECK: @test1
; CHECK: ret i32 0
Teach instcombine's visitLoad to scan back several instructions to find opportunities for store-to-load forwarding or load CSE, in the same way that visitStore scans back to do DSE. Also, define a new helper function for testing whether the addresses of two memory accesses are known to have the same value, and use it in both visitStore and visitLoad. These two changes allow instcombine to eliminate loads in code produced by front-ends that frequently emit obviously redundant addressing for memory references. llvm-svn: 57608
2008-10-16 07:19:35 +08:00
}
fix PR7429, a crash turning a load from a string into a float. llvm-svn: 108113
2010-07-12 08:22:51 +08:00
; PR7429
@.str = private constant [4 x i8] c"XYZ\00"
define float @test2() {
%tmp = load float* bitcast ([4 x i8]* @.str to float*), align 1
ret float %tmp
; CHECK: @test2
; CHECK: ret float 0x3806965600000000
ConstantFolding: Evaluate GEP indices in the index type. This fixes some edge cases that we would get wrong with uint64_ts. PR14986. llvm-svn: 173289
2013-01-24 04:41:05 +08:00
}
@rslts32 = global [36 x i32] zeroinitializer, align 4
@expect32 = internal constant [36 x i32][ i32 1, i32 2, i32 0, i32 100, i32 3,
i32 4, i32 0, i32 -7, i32 4, i32 4, i32 8, i32 8, i32 1, i32 3, i32 8, i32 3,
i32 4, i32 -2, i32 2, i32 8, i32 83, i32 77, i32 8, i32 17, i32 77, i32 88, i32
22, i32 33, i32 44, i32 88, i32 77, i32 4, i32 4, i32 7, i32 -7, i32 -8] ,
align 4
; PR14986
define void @test3() nounwind {
; This is a weird way of computing zero.
%l = load i32* getelementptr ([36 x i32]* @expect32, i32 29826161, i32 28), align 4
store i32 %l, i32* getelementptr ([36 x i32]* @rslts32, i32 29826161, i32 28), align 4
ret void
; CHECK: @test3
; CHECK: store i32 1, i32* getelementptr inbounds ([36 x i32]* @rslts32, i32 0, i32 0)
}