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* [gcc r12-5800] Prefer INT_SSE_REGS for SSE_FLOAT_MODE_P in preferred_reload_class.
@ 2021-12-06 10:15 hongtao Liu
0 siblings, 0 replies; only message in thread
From: hongtao Liu @ 2021-12-06 10:15 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:d1011a41efd121ede2f427c1dffd6ac62f92962e
commit r12-5800-gd1011a41efd121ede2f427c1dffd6ac62f92962e
Author: liuhongt <hongtao.liu@intel.com>
Date: Tue Nov 30 13:50:11 2021 +0800
Prefer INT_SSE_REGS for SSE_FLOAT_MODE_P in preferred_reload_class.
When moves between integer and sse registers are cheap.
2021-12-06 Hongtao Liu <Hongtao.liu@intel.com>
Uroš Bizjak <ubizjak@gmail.com>
gcc/ChangeLog:
PR target/95740
* config/i386/i386.c (ix86_preferred_reload_class): Allow
integer regs when moves between register units are cheap.
* config/i386/i386.h (INT_SSE_CLASS_P): New.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr95740.c: New test.
Diff:
---
gcc/config/i386/i386.c | 12 ++++++++++--
gcc/config/i386/i386.h | 2 ++
gcc/testsuite/gcc.target/i386/pr95740.c | 26 ++++++++++++++++++++++++++
3 files changed, 38 insertions(+), 2 deletions(-)
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index ccb57afee05..52547b0f057 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -19214,9 +19214,17 @@ ix86_preferred_reload_class (rtx x, reg_class_t regclass)
return NO_REGS;
}
- /* Prefer SSE regs only, if we can use them for math. */
+ /* Prefer SSE if we can use them for math. Also allow integer regs
+ when moves between register units are cheap. */
if (SSE_FLOAT_MODE_P (mode) && TARGET_SSE_MATH)
- return SSE_CLASS_P (regclass) ? regclass : NO_REGS;
+ {
+ if (TARGET_INTER_UNIT_MOVES_FROM_VEC
+ && TARGET_INTER_UNIT_MOVES_TO_VEC
+ && GET_MODE_SIZE (mode) <= GET_MODE_SIZE (word_mode))
+ return INT_SSE_CLASS_P (regclass) ? regclass : NO_REGS;
+ else
+ return SSE_CLASS_P (regclass) ? regclass : NO_REGS;
+ }
/* Generally when we see PLUS here, it's the function invariant
(plus soft-fp const_int). Which can only be computed into general
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 4f70085d793..46fdd6e1088 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -1279,6 +1279,8 @@ enum reg_class
reg_class_subset_p ((CLASS), FLOAT_REGS)
#define SSE_CLASS_P(CLASS) \
reg_class_subset_p ((CLASS), ALL_SSE_REGS)
+#define INT_SSE_CLASS_P(CLASS) \
+ reg_class_subset_p ((CLASS), INT_SSE_REGS)
#define MMX_CLASS_P(CLASS) \
((CLASS) == MMX_REGS)
#define MASK_CLASS_P(CLASS) \
diff --git a/gcc/testsuite/gcc.target/i386/pr95740.c b/gcc/testsuite/gcc.target/i386/pr95740.c
new file mode 100644
index 00000000000..7ecd71ba8c1
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr95740.c
@@ -0,0 +1,26 @@
+/* { dg-do compile { target { ! ia32 } } } */
+/* { dg-options "-msse2 -O2 -mtune=generic -mtune-ctrl=use_incdec -masm=att -mfpmath=sse" } */
+/* { dg-final { scan-assembler-times {(?n)movd[\t ]*%xmm0.*%eax} 1 } } */
+/* { dg-final { scan-assembler-times {(?n)incl[\t ]*%eax} 1 } } */
+/* { dg-final { scan-assembler-times {(?n)movq[\t ]*%xmm0.*%rax} 1 } } */
+/* { dg-final { scan-assembler-times {(?n)incq[\t ]*%rax} 1 } } */
+
+int
+foo (float a)
+{
+ union{
+ int b;
+ float a;}u;
+ u.a = a;
+ return u.b + 1;
+}
+
+long long
+foo1 (double a)
+{
+ union{
+ long long b;
+ double a;}u;
+ u.a = a;
+ return u.b + 1;
+}
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