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* [gcc r11-3287] [PATCH 3/5][Arm] New pattern for CSINC instructions
@ 2020-09-18 16:05 Omar Tahir
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From: Omar Tahir @ 2020-09-18 16:05 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:778f19ff953792702c0a7e1fde00214709d9317e
commit r11-3287-g778f19ff953792702c0a7e1fde00214709d9317e
Author: Sudi Das <sudi.das@arm.com>
Date: Fri Sep 18 16:30:11 2020 +0100
[PATCH 3/5][Arm] New pattern for CSINC instructions
This patch adds a new pattern, *thumb2_csinc, for generating CSINC
instructions. It also modifies an existing pattern, *thumb2_cond_arith, to
output CINC when the operation is an addition and TARGET_COND_ARITH is true.
gcc/ChangeLog:
* config/arm/thumb2.md (*thumb2_csinc): New.
(*thumb2_cond_arith): Generate CINC where possible.
gcc/testsuite/ChangeLog:
* gcc.target/arm/csinc-1.c: New test.
Co-authored-by: Omar Tahir <omar.tahir@arm.com>
Diff:
---
gcc/config/arm/thumb2.md | 19 +++++++++++++++++++
gcc/testsuite/gcc.target/arm/csinc-1.c | 23 +++++++++++++++++++++++
2 files changed, 42 insertions(+)
diff --git a/gcc/config/arm/thumb2.md b/gcc/config/arm/thumb2.md
index d648ba1da53..0ff5a537f8f 100644
--- a/gcc/config/arm/thumb2.md
+++ b/gcc/config/arm/thumb2.md
@@ -744,6 +744,10 @@
return \"%i5\\t%0, %1, %2, lsr #31\";
output_asm_insn (\"cmp\\t%2, %3\", operands);
+
+ if (GET_CODE (operands[5]) == PLUS && TARGET_COND_ARITH)
+ return \"cinc\\t%0, %1, %d4\";
+
if (GET_CODE (operands[5]) == AND)
{
output_asm_insn (\"ite\\t%D4\", operands);
@@ -952,6 +956,21 @@
(set_attr "predicable" "no")]
)
+(define_insn "*thumb2_csinc"
+ [(set (match_operand:SI 0 "arm_general_register_operand" "=r, r")
+ (if_then_else:SI
+ (match_operand 1 "arm_comparison_operation" "")
+ (plus:SI (match_operand:SI 2 "arm_general_register_operand" "r, r")
+ (const_int 1))
+ (match_operand:SI 3 "reg_or_zero_operand" "r, Pz")))]
+ "TARGET_COND_ARITH"
+ "@
+ csinc\\t%0, %3, %2, %D1
+ csinc\\t%0, zr, %2, %D1"
+ [(set_attr "type" "csel")
+ (set_attr "predicable" "no")]
+)
+
(define_insn "*thumb2_movcond"
[(set (match_operand:SI 0 "s_register_operand" "=Ts,Ts,Ts")
(if_then_else:SI
diff --git a/gcc/testsuite/gcc.target/arm/csinc-1.c b/gcc/testsuite/gcc.target/arm/csinc-1.c
new file mode 100644
index 00000000000..b9928493862
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/csinc-1.c
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target arm_arch_v8_1m_main_ok } */
+/* { dg-options "-O2 -march=armv8.1-m.main" } */
+
+int
+test_csinc32_condasn1(int w0, int w1, int w2, int w3)
+{
+ int w4;
+
+ /* { dg-final { scan-assembler "csinc\tr\[0-9\]*.*ne" } } */
+ w4 = (w0 == w1) ? (w2 + 1) : w3;
+ return w4;
+}
+
+int
+test_csinc32_condasn2(int w0, int w1, int w2, int w3)
+{
+ int w4;
+
+ /* { dg-final { scan-assembler "csinc\tr\[0-9\]*.*eq" } } */
+ w4 = (w0 == w1) ? w3 : (w2 + 1);
+ return w4;
+}
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