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llvm-mirror/test/CodeGen/X86/isnan.ll
Chris Lattner cd147e5596 Fold comparisons against a constant nan, and optimize ORD/UNORD
comparisons with a constant.  This allows us to compile isnan to:

_foo:
	fcmpu cr7, f1, f1
	mfcr r2
	rlwinm r3, r2, 0, 31, 31
	blr 

instead of:

LCPI1_0:					;  float
	.space	4
_foo:
	lis r2, ha16(LCPI1_0)
	lfs f0, lo16(LCPI1_0)(r2)
	fcmpu cr7, f1, f0
	mfcr r2
	rlwinm r3, r2, 0, 31, 31
	blr 

llvm-svn: 45405
2007-12-29 08:37:08 +00:00

12 lines
312 B
LLVM

; RUN: llvm-as < %s | llc -march=x86 -mcpu=yonah | not grep pxor
; This should not need to materialize 0.0 to evaluate the condition.
define i32 @test(double %X) nounwind {
entry:
%tmp6 = fcmp uno double %X, 0.000000e+00 ; <i1> [#uses=1]
%tmp67 = zext i1 %tmp6 to i32 ; <i32> [#uses=1]
ret i32 %tmp67
}