1 ; RUN: opt < %s -instcombine -S | FileCheck %s 2 ; ModuleID = '3555a.c' 3 ; sqrt(fabs) cannot be negative zero, so we should eliminate the fadd. 4 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" 5 target triple = "i386-apple-darwin9.8" 6 7 ; CHECK: @mysqrt 8 ; CHECK-NOT: fadd 9 ; CHECK: ret 10 define double @mysqrt(double %x) nounwind { 11 entry: 12 %x_addr = alloca double ; <double*> [#uses=2] 13 %retval = alloca double, align 8 ; <double*> [#uses=2] 14 %0 = alloca double, align 8 ; <double*> [#uses=2] 15 %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0] 16 store double %x, double* %x_addr 17 %1 = load double* %x_addr, align 8 ; <double> [#uses=1] 18 %2 = call double @fabs(double %1) nounwind readnone ; <double> [#uses=1] 19 %3 = call double @sqrt(double %2) nounwind readonly ; <double> [#uses=1] 20 %4 = fadd double %3, 0.000000e+00 ; <double> [#uses=1] 21 store double %4, double* %0, align 8 22 %5 = load double* %0, align 8 ; <double> [#uses=1] 23 store double %5, double* %retval, align 8 24 br label %return 25 26 return: ; preds = %entry 27 %retval1 = load double* %retval ; <double> [#uses=1] 28 ret double %retval1 29 } 30 31 declare double @fabs(double) 32 33 declare double @sqrt(double) nounwind readonly 34
