LoongArch: Define LOGICAL_OP_NON_SHORT_CIRCUIT

Define LOGICAL_OP_NON_SHORT_CIRCUIT as 0, for a short-circuit branch, use the
short-circuit operation instead of the non-short-circuit operation.

SPEC2017 performance evaluation shows 1% performance improvement for fprate
GEOMEAN and no obvious regression for others. Especially, 526.blender_r +10.6%
on 3A6000.

This modification will introduce the following FAIL items:

FAIL: gcc.dg/tree-ssa/copy-headers-8.c scan-tree-dump-times ch2 "Conditional combines static and invariant" 1
FAIL: gcc.dg/tree-ssa/copy-headers-8.c scan-tree-dump-times ch2 "Will duplicate bb" 2
FAIL: gcc.dg/tree-ssa/update-threading.c scan-tree-dump-times optimized "Invalid sum" 0

gcc/ChangeLog:

	* config/loongarch/loongarch.h (LOGICAL_OP_NON_SHORT_CIRCUIT): Define.

gcc/testsuite/ChangeLog:

	* gcc.target/loongarch/short-circuit.c: New test.

diff --git a/gcc/config/loongarch/loongarch.h b/gcc/config/loongarch/loongarch.h
index 4e6ede926d323b936c829bc44d3ec57fbb258b9d..8b453ab3140d86d9e6e9f26f90b136f3514f92e4 100644 (file)
--- a/gcc/config/loongarch/loongarch.h
+++ b/gcc/config/loongarch/loongarch.h
@@ -869,6 +869,7 @@ typedef struct {
    1 is the default; other values are interpreted relative to that.  */
 
 #define BRANCH_COST(speed_p, predictable_p) la_branch_cost
+#define LOGICAL_OP_NON_SHORT_CIRCUIT 0
 
 /* Return the asm template for a conditional branch instruction.
    OPCODE is the opcode's mnemonic and OPERANDS is the asm template for

diff --git a/gcc/testsuite/gcc.target/loongarch/short-circuit.c b/gcc/testsuite/gcc.target/loongarch/short-circuit.c
new file mode 100644 (file)
index 0000000..bed585e
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/short-circuit.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ffast-math -fdump-tree-gimple" } */
+
+int
+short_circuit (float *a)
+{
+  float t1x = a[0];
+  float t2x = a[1];
+  float t1y = a[2];
+  float t2y = a[3];
+  float t1z = a[4];
+  float t2z = a[5];
+
+  if (t1x > t2y  || t2x < t1y  || t1x > t2z || t2x < t1z || t1y > t2z || t2y < t1z)
+    return 0;
+
+  return 1;
+}
+/* { dg-final { scan-tree-dump-times "if" 6 "gimple" } } */