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This readme entry is done, testcase here: CodeGen/X86/zero-remat.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47106 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-02-14 05:39:46 +00:00
parent 1d1ef14248
commit 8b0cb7bcc6
2 changed files with 2 additions and 14 deletions
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14
lib/Target/X86/README-FPStack.txt
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@ -9,20 +9,6 @@ http://gcc.gnu.org/ml/gcc-patches/2004-04/msg00659.html
//===---------------------------------------------------------------------===//
On darwin/x86, we should codegen:
ret double 0.000000e+00
as fld0/ret, not as:
movl $0, 4(%esp)
movl $0, (%esp)
fldl (%esp)
...
ret
//===---------------------------------------------------------------------===//
This should use fiadd on chips where it is profitable:
double foo(double P, int *I) { return P+*I; }

2
test/CodeGen/X86/zero-remat.ll
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@ -1,5 +1,7 @@
; RUN: llvm-as < %s | llc -march=x86-64 | grep xor | count 4
; RUN: llvm-as < %s | llc -march=x86-64 -stats -info-output-file - | grep asm-printer | grep 12
; RUN: llvm-as < %s | llc -march=x86 | grep fldz
; RUN: llvm-as < %s | llc -march=x86 | not grep fldl
declare void @bar(double %x)
declare void @barf(float %x)