Hi,
This patch makes both outputs of neon_vzip/vuzp/vtrn_internal
explicitly dependent on both inputs, preventing incorrect
optimization:
for
(a,b)<- vzip (c,d)
and
(e,f) <- vzip (g,d)
CSE decides that b==f, since b and f depend only on d.
Tested on arm-linux-gnueabi. OK for trunk?
OK for 4.6 after testing?
Thanks,
Ira
ChangeLog:
2011-04-07 Ulrich Weigand <ulrich.weig...@linaro.org>
Ira Rosen <ira.ro...@linaro.org>
PR target/48252
* config/arm/arm.c (neon_emit_pair_result_insn): Swap arguments
to match neon_vzip/vuzp/vtrn_internal.
* config/arm/neon.md (neon_vtrn<mode>_internal): Make both
outputs explicitly dependent on both inputs.
(neon_vzip<mode>_internal, neon_vuzp<mode>_internal): Likewise.
testsuite/Changelog:
PR target/48252
* gcc.target/arm/pr48252.c: New test.
Index: testsuite/gcc.target/arm/pr48252.c
===================================================================
--- testsuite/gcc.target/arm/pr48252.c (revision 0)
+++ testsuite/gcc.target/arm/pr48252.c (revision 0)
@@ -0,0 +1,31 @@
+/* { dg-do run } */
+/* { dg-require-effective-target arm_neon_hw } */
+/* { dg-options "-O2" } */
+/* { dg-add-options arm_neon } */
+
+#include "arm_neon.h"
+#include <stdlib.h>
+
+int main(void)
+{
+ uint8x8_t v1 = {1, 1, 1, 1, 1, 1, 1, 1};
+ uint8x8_t v2 = {2, 2, 2, 2, 2, 2, 2, 2};
+ uint8x8x2_t vd1, vd2;
+ union {uint8x8_t v; uint8_t buf[8];} d1, d2, d3, d4;
+ int i;
+
+ vd1 = vzip_u8(v1, vdup_n_u8(0));
+ vd2 = vzip_u8(v2, vdup_n_u8(0));
+
+ vst1_u8(d1.buf, vd1.val[0]);
+ vst1_u8(d2.buf, vd1.val[1]);
+ vst1_u8(d3.buf, vd2.val[0]);
+ vst1_u8(d4.buf, vd2.val[1]);
+
+ for (i = 0; i < 8; i++)
+ if ((i % 2 == 0 && d4.buf[i] != 2)
+ || (i % 2 == 1 && d4.buf[i] != 0))
+ abort ();
+
+ return 0;
+}
Index: config/arm/arm.c
===================================================================
--- config/arm/arm.c (revision 172019)
+++ config/arm/arm.c (working copy)
@@ -19593,7 +19593,7 @@ neon_emit_pair_result_insn (enum machine
rtx tmp1 = gen_reg_rtx (mode);
rtx tmp2 = gen_reg_rtx (mode);
- emit_insn (intfn (tmp1, op1, tmp2, op2));
+ emit_insn (intfn (tmp1, op1, op2, tmp2));
emit_move_insn (mem, tmp1);
mem = adjust_address (mem, mode, GET_MODE_SIZE (mode));
Index: config/arm/neon.md
===================================================================
--- config/arm/neon.md (revision 172019)
+++ config/arm/neon.md (working copy)
@@ -4092,13 +4092,14 @@
(define_insn "neon_vtrn<mode>_internal"
[(set (match_operand:VDQW 0 "s_register_operand" "=w")
- (unspec:VDQW [(match_operand:VDQW 1 "s_register_operand" "0")]
- UNSPEC_VTRN1))
- (set (match_operand:VDQW 2 "s_register_operand" "=w")
- (unspec:VDQW [(match_operand:VDQW 3 "s_register_operand" "2")]
- UNSPEC_VTRN2))]
+ (unspec:VDQW [(match_operand:VDQW 1 "s_register_operand" "0")
+ (match_operand:VDQW 2 "s_register_operand" "w")]
+ UNSPEC_VTRN1))
+ (set (match_operand:VDQW 3 "s_register_operand" "=2")
+ (unspec:VDQW [(match_dup 1) (match_dup 2)]
+ UNSPEC_VTRN2))]
"TARGET_NEON"
- "vtrn.<V_sz_elem>\t%<V_reg>0, %<V_reg>2"
+ "vtrn.<V_sz_elem>\t%<V_reg>0, %<V_reg>3"
[(set (attr "neon_type")
(if_then_else (ne (symbol_ref "<Is_d_reg>") (const_int 0))
(const_string "neon_bp_simple")
@@ -4118,13 +4119,14 @@
(define_insn "neon_vzip<mode>_internal"
[(set (match_operand:VDQW 0 "s_register_operand" "=w")
- (unspec:VDQW [(match_operand:VDQW 1 "s_register_operand" "0")]
- UNSPEC_VZIP1))
- (set (match_operand:VDQW 2 "s_register_operand" "=w")
- (unspec:VDQW [(match_operand:VDQW 3 "s_register_operand" "2")]
- UNSPEC_VZIP2))]
+ (unspec:VDQW [(match_operand:VDQW 1 "s_register_operand" "0")
+ (match_operand:VDQW 2 "s_register_operand" "w")]
+ UNSPEC_VZIP1))
+ (set (match_operand:VDQW 3 "s_register_operand" "=2")
+ (unspec:VDQW [(match_dup 1) (match_dup 2)]
+ UNSPEC_VZIP2))]
"TARGET_NEON"
- "vzip.<V_sz_elem>\t%<V_reg>0, %<V_reg>2"
+ "vzip.<V_sz_elem>\t%<V_reg>0, %<V_reg>3"
[(set (attr "neon_type")
(if_then_else (ne (symbol_ref "<Is_d_reg>") (const_int 0))
(const_string "neon_bp_simple")
@@ -4144,13 +4146,14 @@
(define_insn "neon_vuzp<mode>_internal"
[(set (match_operand:VDQW 0 "s_register_operand" "=w")
- (unspec:VDQW [(match_operand:VDQW 1 "s_register_operand" "0")]
+ (unspec:VDQW [(match_operand:VDQW 1 "s_register_operand" "0")
+ (match_operand:VDQW 2 "s_register_operand" "w")]
UNSPEC_VUZP1))
- (set (match_operand:VDQW 2 "s_register_operand" "=w")
- (unspec:VDQW [(match_operand:VDQW 3 "s_register_operand" "2")]
- UNSPEC_VUZP2))]
+ (set (match_operand:VDQW 3 "s_register_operand" "=2")
+ (unspec:VDQW [(match_dup 1) (match_dup 2)]
+ UNSPEC_VUZP2))]
"TARGET_NEON"
- "vuzp.<V_sz_elem>\t%<V_reg>0, %<V_reg>2"
+ "vuzp.<V_sz_elem>\t%<V_reg>0, %<V_reg>3"
[(set (attr "neon_type")
(if_then_else (ne (symbol_ref "<Is_d_reg>") (const_int 0))
(const_string "neon_bp_simple")
