72 lines
2.5 KiB
Diff
72 lines
2.5 KiB
Diff
From a2baa4807fdfd381c543eb7ea85edf14dc6c8a20 Mon Sep 17 00:00:00 2001
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From: Jiahao Xu <xujiahao@loongson.cn>
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Date: Tue, 16 Jan 2024 10:32:31 +0800
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Subject: [PATCH 121/188] LoongArch: Define LOGICAL_OP_NON_SHORT_CIRCUIT
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Define LOGICAL_OP_NON_SHORT_CIRCUIT as 0, for a short-circuit branch, use the
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short-circuit operation instead of the non-short-circuit operation.
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SPEC2017 performance evaluation shows 1% performance improvement for fprate
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GEOMEAN and no obvious regression for others. Especially, 526.blender_r +10.6%
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on 3A6000.
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This modification will introduce the following FAIL items:
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FAIL: gcc.dg/tree-ssa/copy-headers-8.c scan-tree-dump-times ch2 "Conditional combines static and invariant" 1
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FAIL: gcc.dg/tree-ssa/copy-headers-8.c scan-tree-dump-times ch2 "Will duplicate bb" 2
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FAIL: gcc.dg/tree-ssa/update-threading.c scan-tree-dump-times optimized "Invalid sum" 0
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gcc/ChangeLog:
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* config/loongarch/loongarch.h (LOGICAL_OP_NON_SHORT_CIRCUIT): Define.
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gcc/testsuite/ChangeLog:
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* gcc.target/loongarch/short-circuit.c: New test.
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---
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gcc/config/loongarch/loongarch.h | 1 +
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.../gcc.target/loongarch/short-circuit.c | 19 +++++++++++++++++++
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2 files changed, 20 insertions(+)
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create mode 100644 gcc/testsuite/gcc.target/loongarch/short-circuit.c
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diff --git a/gcc/config/loongarch/loongarch.h b/gcc/config/loongarch/loongarch.h
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index f54b078b1..15261fdc0 100644
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--- a/gcc/config/loongarch/loongarch.h
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+++ b/gcc/config/loongarch/loongarch.h
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@@ -869,6 +869,7 @@ typedef struct {
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1 is the default; other values are interpreted relative to that. */
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#define BRANCH_COST(speed_p, predictable_p) la_branch_cost
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+#define LOGICAL_OP_NON_SHORT_CIRCUIT 0
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/* Return the asm template for a conditional branch instruction.
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OPCODE is the opcode's mnemonic and OPERANDS is the asm template for
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diff --git a/gcc/testsuite/gcc.target/loongarch/short-circuit.c b/gcc/testsuite/gcc.target/loongarch/short-circuit.c
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new file mode 100644
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index 000000000..bed585ee1
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--- /dev/null
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+++ b/gcc/testsuite/gcc.target/loongarch/short-circuit.c
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@@ -0,0 +1,19 @@
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+/* { dg-do compile } */
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+/* { dg-options "-O2 -ffast-math -fdump-tree-gimple" } */
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+
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+int
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+short_circuit (float *a)
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+{
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+ float t1x = a[0];
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+ float t2x = a[1];
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+ float t1y = a[2];
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+ float t2y = a[3];
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+ float t1z = a[4];
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+ float t2z = a[5];
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+
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+ if (t1x > t2y || t2x < t1y || t1x > t2z || t2x < t1z || t1y > t2z || t2y < t1z)
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+ return 0;
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+
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+ return 1;
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+}
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+/* { dg-final { scan-tree-dump-times "if" 6 "gimple" } } */
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--
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2.43.0
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