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llvm-mirror/test/CodeGen/X86/2007-10-29-ExtendSetCC.ll
Evan Cheng 5fe81cf64e Enable more fold (sext (load x)) -> (sext (truncate (sextload x)))
transformation. Previously, it's restricted by ensuring the number of load uses
is one. Now the restriction is loosened up by allowing setcc uses to be
"extended" (e.g. setcc x, c, eq -> setcc sext(x), sext(c), eq).

llvm-svn: 43465
2007-10-29 19:58:20 +00:00

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513 B
LLVM

; RUN: llvm-as < %s | llc -march=x86 | grep mov | count 1
define i16 @t() signext {
entry:
%tmp180 = load i16* null, align 2 ; <i16> [#uses=3]
%tmp180181 = sext i16 %tmp180 to i32 ; <i32> [#uses=1]
%tmp185 = icmp slt i16 %tmp180, 0 ; <i1> [#uses=1]
br i1 %tmp185, label %cond_true188, label %cond_next245
cond_true188: ; preds = %entry
%tmp195196 = trunc i16 %tmp180 to i8 ; <i8> [#uses=0]
ret i16 0
cond_next245: ; preds = %entry
%tmp256 = and i32 %tmp180181, 15 ; <i32> [#uses=0]
ret i16 0
}