| ; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mcpu=core2 | FileCheck %s |
| ; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mcpu=btver2 | FileCheck %s --check-prefix=BTVER2 |
| ; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+use-recip-est,+avx -x86-recip-refinement-steps=2 | FileCheck %s --check-prefix=REFINE |
| |
| ; If the target's divss/divps instructions are substantially |
| ; slower than rcpss/rcpps with a Newton-Raphson refinement, |
| ; we should generate the estimate sequence. |
| |
| ; See PR21385 ( http://llvm.org/bugs/show_bug.cgi?id=21385 ) |
| ; for details about the accuracy, speed, and implementation |
| ; differences of x86 reciprocal estimates. |
| |
| define float @reciprocal_estimate(float %x) #0 { |
| %div = fdiv fast float 1.0, %x |
| ret float %div |
| |
| ; CHECK-LABEL: reciprocal_estimate: |
| ; CHECK: movss |
| ; CHECK-NEXT: divss |
| ; CHECK-NEXT: movaps |
| ; CHECK-NEXT: retq |
| |
| ; BTVER2-LABEL: reciprocal_estimate: |
| ; BTVER2: vrcpss |
| ; BTVER2: vmulss |
| ; BTVER2: vsubss |
| ; BTVER2: vmulss |
| ; BTVER2: vaddss |
| ; BTVER2-NEXT: retq |
| |
| ; REFINE-LABEL: reciprocal_estimate: |
| ; REFINE: vrcpss |
| ; REFINE: vmulss |
| ; REFINE: vsubss |
| ; REFINE: vmulss |
| ; REFINE: vaddss |
| ; REFINE: vmulss |
| ; REFINE: vsubss |
| ; REFINE: vmulss |
| ; REFINE: vaddss |
| ; REFINE-NEXT: retq |
| } |
| |
| define <4 x float> @reciprocal_estimate_v4f32(<4 x float> %x) #0 { |
| %div = fdiv fast <4 x float> <float 1.0, float 1.0, float 1.0, float 1.0>, %x |
| ret <4 x float> %div |
| |
| ; CHECK-LABEL: reciprocal_estimate_v4f32: |
| ; CHECK: movaps |
| ; CHECK-NEXT: divps |
| ; CHECK-NEXT: movaps |
| ; CHECK-NEXT: retq |
| |
| ; BTVER2-LABEL: reciprocal_estimate_v4f32: |
| ; BTVER2: vrcpps |
| ; BTVER2: vmulps |
| ; BTVER2: vsubps |
| ; BTVER2: vmulps |
| ; BTVER2: vaddps |
| ; BTVER2-NEXT: retq |
| |
| ; REFINE-LABEL: reciprocal_estimate_v4f32: |
| ; REFINE: vrcpps |
| ; REFINE: vmulps |
| ; REFINE: vsubps |
| ; REFINE: vmulps |
| ; REFINE: vaddps |
| ; REFINE: vmulps |
| ; REFINE: vsubps |
| ; REFINE: vmulps |
| ; REFINE: vaddps |
| ; REFINE-NEXT: retq |
| } |
| |
| define <8 x float> @reciprocal_estimate_v8f32(<8 x float> %x) #0 { |
| %div = fdiv fast <8 x float> <float 1.0, float 1.0, float 1.0, float 1.0, float 1.0, float 1.0, float 1.0, float 1.0>, %x |
| ret <8 x float> %div |
| |
| ; CHECK-LABEL: reciprocal_estimate_v8f32: |
| ; CHECK: movaps |
| ; CHECK: movaps |
| ; CHECK-NEXT: divps |
| ; CHECK-NEXT: divps |
| ; CHECK-NEXT: movaps |
| ; CHECK-NEXT: movaps |
| ; CHECK-NEXT: retq |
| |
| ; BTVER2-LABEL: reciprocal_estimate_v8f32: |
| ; BTVER2: vrcpps |
| ; BTVER2: vmulps |
| ; BTVER2: vsubps |
| ; BTVER2: vmulps |
| ; BTVER2: vaddps |
| ; BTVER2-NEXT: retq |
| |
| ; REFINE-LABEL: reciprocal_estimate_v8f32: |
| ; REFINE: vrcpps |
| ; REFINE: vmulps |
| ; REFINE: vsubps |
| ; REFINE: vmulps |
| ; REFINE: vaddps |
| ; REFINE: vmulps |
| ; REFINE: vsubps |
| ; REFINE: vmulps |
| ; REFINE: vaddps |
| ; REFINE-NEXT: retq |
| } |
| |
| attributes #0 = { "unsafe-fp-math"="true" } |