PR target/106122: Don't update %esp via the stack with -Oz on x86.
When optimizing for size with -Oz, setting a register can be minimized by pushing an immediate value to the stack and popping it to the destination. Alas the one general register that shouldn't be updated via the stack is the stack pointer itself, where "pop %esp" can't be represented in GCC's RTL ("use of a register mentioned in pre_inc, pre_dec, post_inc or post_dec is not permitted within the same instruction"). This patch fixes PR target/106122 by explicitly checking for SP_REG in the problematic peephole2. 2022-07-O3 Roger Sayle <roger@nextmovesoftware.com> gcc/ChangeLog PR target/106122 * config/i386/i386.md (peephole2): Avoid generating pop %esp when optimizing for size. gcc/testsuite/ChangeLog PR target/106122 * gcc.target/i386/pr106122.c: New test case.
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@ -2519,7 +2519,8 @@
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"optimize_insn_for_size_p () && optimize_size > 1
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&& operands[1] != const0_rtx
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&& IN_RANGE (INTVAL (operands[1]), -128, 127)
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&& !ix86_red_zone_used"
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&& !ix86_red_zone_used
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&& REGNO (operands[0]) != SP_REG"
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[(set (match_dup 2) (match_dup 1))
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(set (match_dup 0) (match_dup 3))]
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{
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@ -0,0 +1,15 @@
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/* PR middle-end/106122 */
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/* { dg-do compile } */
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/* { dg-options "-Oz" } */
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register volatile int a __asm__("%esp");
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void foo (void *);
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void bar (void *);
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void
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baz (void)
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{
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foo (__builtin_return_address (0));
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a = 0;
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bar (__builtin_return_address (0));
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}
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