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fe6fe553f7
The size savings are significant, and from what I can tell, both ICC and GCC do this. Differential Revision: http://reviews.llvm.org/D18573 llvm-svn: 264966
46 lines
1.4 KiB
LLVM
46 lines
1.4 KiB
LLVM
; RUN: llc < %s -mtriple=i386-apple-darwin -disable-fp-elim -no-x86-call-frame-opt | FileCheck %s
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%struct.decode_t = type { i8, i8, i8, i8, i16, i8, i8, %struct.range_t** }
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%struct.range_t = type { float, float, i32, i32, i32, [0 x i8] }
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define i32 @decode_byte(%struct.decode_t* %decode) nounwind {
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; CHECK-LABEL: decode_byte:
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; CHECK: pushl
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; CHECK: popl
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; CHECK: jmp
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; CHECK: popl
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entry:
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%tmp2 = getelementptr %struct.decode_t, %struct.decode_t* %decode, i32 0, i32 4 ; <i16*> [#uses=1]
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%tmp23 = bitcast i16* %tmp2 to i32* ; <i32*> [#uses=1]
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%tmp4 = load i32, i32* %tmp23 ; <i32> [#uses=1]
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%tmp514 = lshr i32 %tmp4, 24 ; <i32> [#uses=1]
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%tmp56 = trunc i32 %tmp514 to i8 ; <i8> [#uses=1]
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%tmp7 = icmp eq i8 %tmp56, 0 ; <i1> [#uses=1]
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br i1 %tmp7, label %UnifiedReturnBlock, label %cond_true
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cond_true: ; preds = %entry
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%tmp10 = tail call i32 @f( %struct.decode_t* %decode ) ; <i32> [#uses=1]
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ret i32 %tmp10
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UnifiedReturnBlock: ; preds = %entry
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ret i32 0
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}
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declare i32 @f(%struct.decode_t*)
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; There should be no store for the undef operand.
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; CHECK: _test2:
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; CHECK-NOT: 8(%esp)
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; CHECK: 4(%esp)
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; CHECK-NOT: 8(%esp)
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; CHECK: calll
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declare i32 @foo(i32, i32, i32)
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define void @test2() nounwind {
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entry:
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%call = call i32 @foo(i32 8, i32 6, i32 undef)
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ret void
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}
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