[X86][FastIsel] Teach how to select scalar integer to float/double conversions.

This patch teaches fast-isel how to select a (V)CVTSI2SSrr for an integer to 
float conversion, and how to select a (V)CVTSI2SDrr for an integer to double
conversion.

Added test 'fast-isel-int-float-conversion.ll'.

Differential Revision: http://reviews.llvm.org/D7698

llvm-svn: 229589

1 files changed, 45 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/fast-isel-int-float-conversion.ll b/llvm/test/CodeGen/X86/fast-isel-int-float-conversion.ll
new file mode 100644
index 00000000000..38697229d34
--- /dev/null
+++ b/llvm/test/CodeGen/X86/fast-isel-int-float-conversion.ll
@@ -0,0 +1,45 @@
+; RUN: llc -mtriple=x86_64-unknown-unknown -mcpu=generic -mattr=+sse2 -O0 --fast-isel-abort < %s | FileCheck %s --check-prefix=ALL --check-prefix=SSE2
+; RUN: llc -mtriple=x86_64-unknown-unknown -mcpu=generic -mattr=+avx -O0 --fast-isel-abort < %s | FileCheck %s --check-prefix=ALL --check-prefix=AVX
+
+
+define double @int_to_double_rr(i32 %a) {
+; ALL-LABEL: int_to_double_rr:
+; SSE2: cvtsi2sdl %edi, %xmm0
+; AVX: vcvtsi2sdl %edi, %xmm0, %xmm0
+; ALL-NEXT: ret
+entry:
+  %0 = sitofp i32 %a to double
+  ret double %0
+}
+
+define double @int_to_double_rm(i32* %a) {
+; ALL-LABEL: int_to_double_rm:
+; SSE2: cvtsi2sdl (%rdi), %xmm0
+; AVX: vcvtsi2sdl (%rdi), %xmm0, %xmm0
+; ALL-NEXT: ret
+entry:
+  %0 = load i32* %a
+  %1 = sitofp i32 %0 to double
+  ret double %1
+}
+
+define float @int_to_float_rr(i32 %a) {
+; ALL-LABEL: int_to_float_rr:
+; SSE2: cvtsi2ssl %edi, %xmm0
+; AVX: vcvtsi2ssl %edi, %xmm0, %xmm0
+; ALL-NEXT: ret
+entry:
+  %0 = sitofp i32 %a to float
+  ret float %0
+}
+
+define float @int_to_float_rm(i32* %a) {
+; ALL-LABEL: int_to_float_rm:
+; SSE2: cvtsi2ssl (%rdi), %xmm0
+; AVX: vcvtsi2ssl (%rdi), %xmm0, %xmm0
+; ALL-NEXT: ret
+entry:
+  %0 = load i32* %a
+  %1 = sitofp i32 %0 to float
+  ret float %1
+}