R600/SI: Fix fneg for 0.0
V_ADD_F32 with source modifier does not produce -0.0 for this. Just
manipulate the sign bit directly instead.
Also add a pattern for (fneg (fabs ...)).
Fixes a bunch of bit encoding piglit tests with radeonsi.
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 200743
diff --git a/llvm/test/CodeGen/R600/fneg.ll b/llvm/test/CodeGen/R600/fneg.ll
index 9446aa8..f4e6be6 100644
--- a/llvm/test/CodeGen/R600/fneg.ll
+++ b/llvm/test/CodeGen/R600/fneg.ll
@@ -4,7 +4,7 @@
; R600-CHECK-LABEL: @fneg
; R600-CHECK: -PV
; SI-CHECK-LABEL: @fneg
-; SI-CHECK: V_ADD_F32_e64 v{{[0-9]}}, s{{[0-9]}}, 0, 0, 0, 0, 1
+; SI-CHECK: V_XOR_B32
define void @fneg(float addrspace(1)* %out, float %in) {
entry:
%0 = fsub float -0.000000e+00, %in
@@ -16,8 +16,8 @@
; R600-CHECK: -PV
; R600-CHECK: -PV
; SI-CHECK-LABEL: @fneg_v2
-; SI-CHECK: V_ADD_F32_e64 v{{[0-9]}}, s{{[0-9]}}, 0, 0, 0, 0, 1
-; SI-CHECK: V_ADD_F32_e64 v{{[0-9]}}, s{{[0-9]}}, 0, 0, 0, 0, 1
+; SI-CHECK: V_XOR_B32
+; SI-CHECK: V_XOR_B32
define void @fneg_v2(<2 x float> addrspace(1)* nocapture %out, <2 x float> %in) {
entry:
%0 = fsub <2 x float> <float -0.000000e+00, float -0.000000e+00>, %in
@@ -31,10 +31,10 @@
; R600-CHECK: -PV
; R600-CHECK: -PV
; SI-CHECK-LABEL: @fneg_v4
-; SI-CHECK: V_ADD_F32_e64 v{{[0-9]}}, s{{[0-9]}}, 0, 0, 0, 0, 1
-; SI-CHECK: V_ADD_F32_e64 v{{[0-9]}}, s{{[0-9]}}, 0, 0, 0, 0, 1
-; SI-CHECK: V_ADD_F32_e64 v{{[0-9]}}, s{{[0-9]}}, 0, 0, 0, 0, 1
-; SI-CHECK: V_ADD_F32_e64 v{{[0-9]}}, s{{[0-9]}}, 0, 0, 0, 0, 1
+; SI-CHECK: V_XOR_B32
+; SI-CHECK: V_XOR_B32
+; SI-CHECK: V_XOR_B32
+; SI-CHECK: V_XOR_B32
define void @fneg_v4(<4 x float> addrspace(1)* nocapture %out, <4 x float> %in) {
entry:
%0 = fsub <4 x float> <float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00>, %in