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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/107051] redundant loads when copying a union Date: Tue, 27 Sep 2022 13:18:17 +0000 [thread overview] Message-ID: <bug-107051-4-CRkuwib1QZ@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-107051-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107051 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Last reconfirmed| |2022-09-27 Ever confirmed|0 |1 Status|UNCONFIRMED |NEW --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- With -O2 I see func_1: .LFB0: .cfi_startproc movl e(%rip), %eax testl %eax, %eax je .L2 .L3: jmp .L3 .p2align 4,,10 .p2align 3 .L2: movq g_284+8(%rip), %rax movq %rax, g_284(%rip) ret note that with -O1 we retain c = g_284[1]; c$f0_3 = g_284[1].f0; c.f0 = c$f0_3; g_284[0] = c; after GIMPLE optimization which possibly explains this compared to c = g_284[1]; g_284[0] = c; with -O2.
next prev parent reply other threads:[~2022-09-27 13:18 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-09-27 11:25 [Bug rtl-optimization/107051] New: " absoler at smail dot nju.edu.cn 2022-09-27 13:18 ` rguenth at gcc dot gnu.org [this message] 2024-03-27 0:21 ` [Bug rtl-optimization/107051] " absoler at smail dot nju.edu.cn
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