6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-25 19:29:53 +00:00
Code Issues Projects Releases Wiki Activity

Handle sqrt in CannotBeNegativeZero. absf and absl

Browse Source 
appear to be misspellings, removed in favor of fabs*.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82796 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2009-09-25 20:54:50 +00:00
parent c76909abfe
commit 9d06175a15
2 changed files with 40 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
lib/Analysis/ValueTracking.cpp
View File

@ -840,9 +840,13 @@ bool llvm::CannotBeNegativeZero(const Value *V, unsigned Depth) {
if (F->isDeclaration()) {
// abs(x) != -0.0
if (F->getName() == "abs") return true;
// abs[lf](x) != -0.0
if (F->getName() == "absf") return true;
if (F->getName() == "absl") return true;
// fabs[lf](x) != -0.0
if (F->getName() == "fabs") return true;
if (F->getName() == "fabsf") return true;
if (F->getName() == "fabsl") return true;
if (F->getName() == "sqrt" || F->getName() == "sqrtf" ||
F->getName() == "sqrtl")
return CannotBeNegativeZero(CI->getOperand(1), Depth+1);
}
}

33
test/Transforms/InstCombine/no-negzero.ll Normal file
View File

@ -0,0 +1,33 @@
; RUN: opt < %s -instcombine -S | FileCheck %s
; ModuleID = '3555a.c'
; sqrt(fabs) cannot be negative zero, so we should eliminate the fadd.
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin9.8"
; CHECK: @mysqrt
; CHECK-NOT: fadd
; CHECK: ret
define double @mysqrt(double %x) nounwind {
entry:
%x_addr = alloca double ; <double*> [#uses=2]
%retval = alloca double, align 8 ; <double*> [#uses=2]
%0 = alloca double, align 8 ; <double*> [#uses=2]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
store double %x, double* %x_addr
%1 = load double* %x_addr, align 8 ; <double> [#uses=1]
%2 = call double @fabs(double %1) nounwind readnone ; <double> [#uses=1]
%3 = call double @sqrt(double %2) nounwind readonly ; <double> [#uses=1]
%4 = fadd double %3, 0.000000e+00 ; <double> [#uses=1]
store double %4, double* %0, align 8
%5 = load double* %0, align 8 ; <double> [#uses=1]
store double %5, double* %retval, align 8
br label %return
return: ; preds = %entry
%retval1 = load double* %retval ; <double> [#uses=1]
ret double %retval1
}
declare double @fabs(double)
declare double @sqrt(double) nounwind readonly