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Refactor and check "onlyReadsMemory" before optimizing builtins.

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This patch is mostly just refactoring a bunch of copy-and-pasted code, but
it also adds a check that the call instructions are readnone or readonly.
That check was already present for sin, cos, sqrt, log2, and exp2 calls, but
it was missing for the rest of the builtins being handled in this code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161282 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2012-08-03 23:29:17 +00:00
parent 6ac8066ae4
commit 53624a2df5
13 changed files with 49 additions and 102 deletions
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4
test/CodeGen/X86/fabs.ll
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@@ -11,7 +11,7 @@ declare x86_fp80 @fabsl(x86_fp80)
; UNSAFE: test1:
; NOOPT: test1:
define float @test1(float %X) {
%Y = call float @fabsf(float %X)
%Y = call float @fabsf(float %X) readnone
ret float %Y
}
; CHECK: {{^[ \t]+fabs$}}
@@ -42,7 +42,7 @@ define double @test2(double %X) {
; UNSAFE: test3:
; NOOPT: test3:
define x86_fp80 @test3(x86_fp80 %X) {
%Y = call x86_fp80 @fabsl(x86_fp80 %X)
%Y = call x86_fp80 @fabsl(x86_fp80 %X) readnone
ret x86_fp80 %Y
}
; CHECK: {{^[ \t]+fabs$}}