llvm-6502/test/CodeGen/X86/x86-setcc-int-to-fp-combine.ll
Simon Pilgrim fa17ce8b6e [SelectionDAG] Fixed issue with uitofp vector constant folding being treated as sitofp
While the uitofp scalar constant folding treats an integer as an unsigned value (from lang ref):

%X = sitofp i8 -1 to double ; yields double:-1.0
%Y = uitofp i8 -1 to double ; yields double:255.0

The vector constant folding was always using sitofp:

%X = sitofp <2 x i8> <i8 -1, i8 -1> to <2 x double> ; yields <double -1.0, double -1.0>
%Y = uitofp <2 x i8> <i8 -1, i8 -1> to <2 x double> ; yields <double -1.0, double -1.0>

This patch fixes this so that the correct opcode is used for sitofp and uitofp.

%X = sitofp <2 x i8> <i8 -1, i8 -1> to <2 x double> ; yields <double -1.0, double -1.0>
%Y = uitofp <2 x i8> <i8 -1, i8 -1> to <2 x double> ; yields <double 255.0, double 255.0>

Differential Revision: http://reviews.llvm.org/D8560

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233033 91177308-0d34-0410-b5e6-96231b3b80d8
2015-03-23 22:44:55 +00:00

90 lines
3.4 KiB
LLVM

; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
define <4 x float> @foo(<4 x float> %val, <4 x float> %test) nounwind {
; CHECK-LABEL: LCPI0_0:
; CHECK-NEXT: .long 1065353216 ## 0x3f800000
; CHECK-NEXT: .long 1065353216 ## 0x3f800000
; CHECK-NEXT: .long 1065353216 ## 0x3f800000
; CHECK-NEXT: .long 1065353216 ## 0x3f800000
; CHECK-LABEL: foo:
; CHECK: cmpeqps %xmm1, %xmm0
; CHECK-NEXT: andps LCPI0_0(%rip), %xmm0
; CHECK-NEXT: retq
%cmp = fcmp oeq <4 x float> %val, %test
%ext = zext <4 x i1> %cmp to <4 x i32>
%result = sitofp <4 x i32> %ext to <4 x float>
ret <4 x float> %result
}
; Make sure the operation doesn't try to get folded when the sizes don't match,
; as that ends up crashing later when trying to form a bitcast operation for
; the folded nodes.
define void @foo1(<4 x float> %val, <4 x float> %test, <4 x double>* %p) nounwind {
; CHECK-LABEL: LCPI1_0:
; CHECK-NEXT: .long 1 ## 0x1
; CHECK-NEXT: .long 1 ## 0x1
; CHECK-NEXT: .long 1 ## 0x1
; CHECK-NEXT: .long 1 ## 0x1
; CHECK-LABEL: foo1:
; FIXME: The operation gets scalarized. If/when the compiler learns to better
; use [V]CVTDQ2PD, this will need updated.
; CHECK: cvtsi2sdq
; CHECK: cvtsi2sdq
; CHECK: cvtsi2sdq
; CHECK: cvtsi2sdq
%cmp = fcmp oeq <4 x float> %val, %test
%ext = zext <4 x i1> %cmp to <4 x i32>
%result = sitofp <4 x i32> %ext to <4 x double>
store <4 x double> %result, <4 x double>* %p
ret void
}
; Also test the general purpose constant folding of int->fp.
define void @foo2(<4 x float>* noalias %result) nounwind {
; CHECK-LABEL: LCPI2_0:
; CHECK-NEXT: .long 1082130432 ## float 4.000000e+00
; CHECK-NEXT: .long 1084227584 ## float 5.000000e+00
; CHECK-NEXT: .long 1086324736 ## float 6.000000e+00
; CHECK-NEXT: .long 1088421888 ## float 7.000000e+00
; CHECK-LABEL: foo2:
; CHECK: movaps LCPI2_0(%rip), %xmm0
%val = uitofp <4 x i32> <i32 4, i32 5, i32 6, i32 7> to <4 x float>
store <4 x float> %val, <4 x float>* %result
ret void
}
; Fold explicit AND operations when the constant isn't a splat of a single
; scalar value like what the zext creates.
define <4 x float> @foo3(<4 x float> %val, <4 x float> %test) nounwind {
; CHECK-LABEL: LCPI3_0:
; CHECK-NEXT: .long 1065353216 ## 0x3f800000
; CHECK-NEXT: .long 0 ## 0x0
; CHECK-NEXT: .long 1065353216 ## 0x3f800000
; CHECK-NEXT: .long 0 ## 0x0
; CHECK-LABEL: foo3:
; CHECK: cmpeqps %xmm1, %xmm0
; CHECK-NEXT: andps LCPI3_0(%rip), %xmm0
%cmp = fcmp oeq <4 x float> %val, %test
%ext = zext <4 x i1> %cmp to <4 x i32>
%and = and <4 x i32> %ext, <i32 255, i32 256, i32 257, i32 258>
%result = sitofp <4 x i32> %and to <4 x float>
ret <4 x float> %result
}
; Test the general purpose constant folding of uint->fp.
define void @foo4(<4 x float>* noalias %result) nounwind {
; CHECK-LABEL: LCPI4_0:
; CHECK-NEXT: .long 1065353216 ## float 1.000000e+00
; CHECK-NEXT: .long 1123942400 ## float 1.270000e+02
; CHECK-NEXT: .long 1124073472 ## float 1.280000e+02
; CHECK-NEXT: .long 1132396544 ## float 2.550000e+02
; CHECK-LABEL: foo4:
; CHECK: movaps LCPI4_0(%rip), %xmm0
%val = uitofp <4 x i8> <i8 1, i8 127, i8 -128, i8 -1> to <4 x float>
store <4 x float> %val, <4 x float>* %result
ret void
}