294 lines
8.6 KiB
Diff
294 lines
8.6 KiB
Diff
2009-04-22 Jakub Jelinek <jakub@redhat.com>
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PR inline-asm/39543
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* fwprop.c (forward_propagate_asm): New function.
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(forward_propagate_and_simplify): Propagate also into __asm, if it
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doesn't increase the number of referenced registers.
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* gcc.target/i386/pr39543-1.c: New test.
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* gcc.target/i386/pr39543-2.c: New test.
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* gcc.target/i386/pr39543-3.c: New test.
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--- gcc/fwprop.c.jj 2009-03-30 12:45:45.000000000 +0200
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+++ gcc/fwprop.c 2009-04-10 16:19:36.000000000 +0200
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@@ -1,5 +1,5 @@
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/* RTL-based forward propagation pass for GNU compiler.
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- Copyright (C) 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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+ Copyright (C) 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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Contributed by Paolo Bonzini and Steven Bosscher.
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This file is part of GCC.
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@@ -852,6 +852,80 @@ forward_propagate_subreg (df_ref use, rt
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return false;
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}
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+/* Try to replace USE with SRC (defined in DEF_INSN) in __asm. */
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+
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+static bool
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+forward_propagate_asm (df_ref use, rtx def_insn, rtx def_set, rtx reg)
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+{
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+ rtx use_insn = DF_REF_INSN (use), src, use_pat, asm_operands, new_rtx, *loc;
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+ int speed_p, i;
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+ df_ref *use_vec;
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+
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+ gcc_assert ((DF_REF_FLAGS (use) & DF_REF_IN_NOTE) == 0);
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+
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+ src = SET_SRC (def_set);
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+ use_pat = PATTERN (use_insn);
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+
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+ /* In __asm don't replace if src might need more registers than
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+ reg, as that could increase register pressure on the __asm. */
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+ use_vec = DF_INSN_USES (def_insn);
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+ if (use_vec[0] && use_vec[1])
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+ return false;
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+
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+ speed_p = optimize_bb_for_speed_p (BLOCK_FOR_INSN (use_insn));
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+ asm_operands = NULL_RTX;
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+ switch (GET_CODE (use_pat))
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+ {
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+ case ASM_OPERANDS:
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+ asm_operands = use_pat;
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+ break;
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+ case SET:
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+ if (MEM_P (SET_DEST (use_pat)))
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+ {
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+ loc = &SET_DEST (use_pat);
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+ new_rtx = propagate_rtx (*loc, GET_MODE (*loc), reg, src, speed_p);
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+ if (new_rtx)
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+ validate_unshare_change (use_insn, loc, new_rtx, true);
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+ }
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+ asm_operands = SET_SRC (use_pat);
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+ break;
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+ case PARALLEL:
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+ for (i = 0; i < XVECLEN (use_pat, 0); i++)
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+ if (GET_CODE (XVECEXP (use_pat, 0, i)) == SET)
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+ {
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+ if (MEM_P (SET_DEST (XVECEXP (use_pat, 0, i))))
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+ {
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+ loc = &SET_DEST (XVECEXP (use_pat, 0, i));
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+ new_rtx = propagate_rtx (*loc, GET_MODE (*loc), reg,
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+ src, speed_p);
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+ if (new_rtx)
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+ validate_unshare_change (use_insn, loc, new_rtx, true);
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+ }
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+ asm_operands = SET_SRC (XVECEXP (use_pat, 0, i));
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+ }
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+ else if (GET_CODE (XVECEXP (use_pat, 0, i)) == ASM_OPERANDS)
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+ asm_operands = XVECEXP (use_pat, 0, i);
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+ break;
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+ default:
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+ gcc_unreachable ();
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+ }
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+
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+ gcc_assert (asm_operands && GET_CODE (asm_operands) == ASM_OPERANDS);
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+ for (i = 0; i < ASM_OPERANDS_INPUT_LENGTH (asm_operands); i++)
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+ {
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+ loc = &ASM_OPERANDS_INPUT (asm_operands, i);
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+ new_rtx = propagate_rtx (*loc, GET_MODE (*loc), reg, src, speed_p);
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+ if (new_rtx)
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+ validate_unshare_change (use_insn, loc, new_rtx, true);
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+ }
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+
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+ if (num_changes_pending () == 0 || !apply_change_group ())
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+ return false;
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+
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+ num_changes++;
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+ return true;
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+}
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+
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/* Try to replace USE with SRC (defined in DEF_INSN) and simplify the
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result. */
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@@ -863,12 +937,16 @@ forward_propagate_and_simplify (df_ref u
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rtx src, reg, new_rtx, *loc;
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bool set_reg_equal;
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enum machine_mode mode;
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+ int asm_use = -1;
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+
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+ if (INSN_CODE (use_insn) < 0)
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+ asm_use = asm_noperands (PATTERN (use_insn));
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- if (!use_set)
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+ if (!use_set && asm_use < 0)
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return false;
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/* Do not propagate into PC, CC0, etc. */
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- if (GET_MODE (SET_DEST (use_set)) == VOIDmode)
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+ if (use_set && GET_MODE (SET_DEST (use_set)) == VOIDmode)
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return false;
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/* If def and use are subreg, check if they match. */
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@@ -900,7 +978,7 @@ forward_propagate_and_simplify (df_ref u
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if (MEM_P (src) && MEM_READONLY_P (src))
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{
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rtx x = avoid_constant_pool_reference (src);
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- if (x != src)
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+ if (x != src && use_set)
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{
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rtx note = find_reg_note (use_insn, REG_EQUAL, NULL_RTX);
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rtx old_rtx = note ? XEXP (note, 0) : SET_SRC (use_set);
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@@ -911,6 +989,9 @@ forward_propagate_and_simplify (df_ref u
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return false;
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}
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+ if (asm_use >= 0)
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+ return forward_propagate_asm (use, def_insn, def_set, reg);
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+
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/* Else try simplifying. */
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if (DF_REF_TYPE (use) == DF_REF_REG_MEM_STORE)
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--- gcc/testsuite/gcc.target/i386/pr39543-1.c.jj 2009-04-09 09:47:16.000000000 +0200
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+++ gcc/testsuite/gcc.target/i386/pr39543-1.c 2009-04-09 09:47:16.000000000 +0200
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@@ -0,0 +1,52 @@
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+/* PR inline-asm/39543 */
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+/* { dg-do compile } */
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+/* { dg-options "-O3 -fomit-frame-pointer" } */
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+
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+float __attribute__ ((aligned (16))) s0[128];
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+const float s1 = 0.707;
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+float s2[8] __attribute__ ((aligned (16)));
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+float s3[8] __attribute__ ((aligned (16)));
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+float s4[16] __attribute__ ((aligned (16)));
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+float s5[16] __attribute__ ((aligned (16)));
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+
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+void
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+foo (int k, float *x, float *y, const float *d, const float *z)
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+{
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+ float *a, *b, *c, *e;
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+
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+ a = x + 2 * k;
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+ b = a + 2 * k;
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+ c = b + 2 * k;
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+ e = y + 2 * k;
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+ __asm__ volatile (""
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+ : "=m" (x[0]), "=m" (b[0]), "=m" (a[0]), "=m" (c[0])
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+ : "m" (y[0]), "m" (y[k * 2]), "m" (x[0]), "m" (a[0])
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+ : "memory");
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+ for (;;)
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+ {
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+ __asm__ volatile (""
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+ :
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+ : "m" (y[2]), "m" (d[2]), "m" (e[2]), "m" (z[2])
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+ : "memory");
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+ if (!--k)
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+ break;
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+ }
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+ __asm__ volatile (""
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+ : "=m" (x[2]), "=m" (x[10]), "=m" (x[6]), "=m" (x[14])
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+ : "m" (y[2]), "m" (y[6]), "m" (x[2]), "m" (x[6]),
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+ "m" (y[18]), "m" (s1)
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+ : "memory");
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+}
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+
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+void
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+bar (float *a)
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+{
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+ foo (4, a, a + 16, s2, s3);
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+ foo (8, a, a + 32, s4, s5);
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+}
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+
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+void
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+baz (void)
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+{
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+ bar (s0);
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+}
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--- gcc/testsuite/gcc.target/i386/pr39543-2.c.jj 2009-04-09 09:47:16.000000000 +0200
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+++ gcc/testsuite/gcc.target/i386/pr39543-2.c 2009-04-09 09:47:16.000000000 +0200
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@@ -0,0 +1,51 @@
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+/* PR inline-asm/39543 */
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+/* { dg-do compile } */
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+/* { dg-options "-O3" } */
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+
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+float __attribute__ ((aligned (16))) s0[128];
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+const float s1 = 0.707;
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+float s2[8] __attribute__ ((aligned (16)));
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+float s3[8] __attribute__ ((aligned (16)));
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+float s4[16] __attribute__ ((aligned (16)));
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+float s5[16] __attribute__ ((aligned (16)));
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+
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+void
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+foo (int k, float *x, float *y, const float *d, const float *z)
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+{
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+ float *a, *b, *c, *e;
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+
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+ a = x + 2 * k;
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+ b = a + 2 * k;
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+ c = b + 2 * k;
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+ e = y + 2 * k;
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+ __asm__ volatile (""
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+ : "=m" (x[0]), "=m" (b[0]), "=m" (a[0]), "=m" (c[0])
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+ : "m" (y[0]), "m" (y[k * 2]), "m" (x[0]), "m" (a[0])
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+ : "memory");
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+ for (;;)
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+ {
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+ __asm__ volatile (""
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+ :
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+ : "m" (y[2]), "m" (d[2]), "m" (e[2]), "m" (z[2])
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+ : "memory");
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+ if (!--k)
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+ break;
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+ }
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+ __asm__ volatile (""
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+ : "=m" (x[2]), "=m" (x[10]), "=m" (x[6]), "=m" (x[14])
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+ : "m" (y[2]), "m" (y[6]), "m" (x[2]), "m" (x[6]), "m" (s1)
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+ : "memory");
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+}
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+
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+void
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+bar (float *a)
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+{
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+ foo (4, a, a + 16, s2, s3);
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+ foo (8, a, a + 32, s4, s5);
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+}
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+
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+void
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+baz (void)
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+{
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+ bar (s0);
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+}
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--- gcc/testsuite/gcc.target/i386/pr39543-3.c.jj 2009-04-09 09:47:16.000000000 +0200
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+++ gcc/testsuite/gcc.target/i386/pr39543-3.c 2009-04-09 09:47:16.000000000 +0200
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@@ -0,0 +1,42 @@
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+/* PR inline-asm/39543 */
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+/* { dg-do compile } */
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+/* { dg-options "-O2" } */
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+
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+int s[128];
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+
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+void
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+f1 (void)
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+{
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+ int i;
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+ asm volatile ("# %0 %1 %2 %3 %4 %5 %6 %7 %8 %9 %10 %11 %12 %13 %14 %15 %16 %17"
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+ : "=r" (i)
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+ : "m" (s[0]), "m" (s[2]), "m" (s[4]), "m" (s[6]), "m" (s[8]),
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+ "m" (s[10]), "m" (s[12]), "m" (s[14]), "m" (s[16]), "m" (s[18]),
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+ "m" (s[20]), "m" (s[22]), "m" (s[24]), "m" (s[26]), "m" (s[28]),
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+ "m" (s[30]), "m" (s[32]));
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+ asm volatile ("# %0 %1 %2 %3 %4 %5 %6 %7 %8 %9 %10 %11 %12 %13 %14 %15 %16 %17"
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+ : "=r" (i)
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+ : "m" (s[0]), "m" (s[2]), "m" (s[4]), "m" (s[6]), "m" (s[8]),
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+ "m" (s[10]), "m" (s[12]), "m" (s[14]), "m" (s[16]), "m" (s[18]),
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+ "m" (s[20]), "m" (s[22]), "m" (s[24]), "m" (s[26]), "m" (s[28]),
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+ "m" (s[30]), "m" (s[32]));
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+}
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+
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+void
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+f2 (int *q)
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+{
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+ int i;
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+ int *p = q + 32;
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+ asm volatile ("# %0 %1 %2 %3 %4 %5 %6 %7 %8 %9 %10 %11 %12 %13 %14 %15 %16 %17"
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+ : "=r" (i)
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+ : "m" (p[0]), "m" (p[2]), "m" (p[4]), "m" (p[6]), "m" (p[8]),
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+ "m" (p[10]), "m" (p[12]), "m" (p[14]), "m" (p[16]), "m" (p[18]),
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+ "m" (p[20]), "m" (p[22]), "m" (p[24]), "m" (p[26]), "m" (p[28]),
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+ "m" (p[30]), "m" (p[32]));
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+ asm volatile ("# %0 %1 %2 %3 %4 %5 %6 %7 %8 %9 %10 %11 %12 %13 %14 %15 %16 %17"
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+ : "=r" (i)
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+ : "m" (p[0]), "m" (p[2]), "m" (p[4]), "m" (p[6]), "m" (p[8]),
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+ "m" (p[10]), "m" (p[12]), "m" (p[14]), "m" (p[16]), "m" (p[18]),
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+ "m" (p[20]), "m" (p[22]), "m" (p[24]), "m" (p[26]), "m" (p[28]),
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+ "m" (p[30]), "m" (p[32]));
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+}
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