llvm-mirror/test/Transforms/InstCombine/shift-trunc-shift.ll

; RUN: opt %s -instcombine -S | grep lshr.*63

define i32 @t1(i64 %d18) {
entry:
	%tmp916 = lshr i64 %d18, 32		; <i64> [#uses=1]
	%tmp917 = trunc i64 %tmp916 to i32		; <i32> [#uses=1]
	%tmp10 = lshr i32 %tmp917, 31		; <i32> [#uses=1]
	ret i32 %tmp10
}
Use opt -S instead of piping bitcode output through llvm-dis. llvm-svn: 81257 2009-09-09 00:34:10 +02:00			`; RUN: opt %s -instcombine -S \| grep lshr.*63`
implement InstCombine/shift-trunc-shift.ll. This allows us to compile: #include <math.h> int t1(double d) { return signbit(d); } into: _t1: movd %xmm0, %rax shrq $63, %rax ret instead of: _t1: movd %xmm0, %rax shrq $32, %rax shrl $31, %eax ret on x86-64. llvm-svn: 45311 2007-12-22 10:07:47 +01:00
			`define i32 @t1(i64 %d18) {`
			`entry:`
			`%tmp916 = lshr i64 %d18, 32 ; <i64> [#uses=1]`
			`%tmp917 = trunc i64 %tmp916 to i32 ; <i32> [#uses=1]`
			`%tmp10 = lshr i32 %tmp917, 31 ; <i32> [#uses=1]`
			`ret i32 %tmp10`
			`}`