https://bugs.kde.org/show_bug.cgi?id=381713
Bug ID: 381713
Summary: optimize CmpNEx(a, 0) as CmpNEZx(a) in VEX IR
Product: valgrind
Version: 3.14 SVN
Platform: Compiled Sources
OS: Linux
Status: UNCONFIRMED
Severity: minor
Priority: NOR
Component: vex
Assignee: jsew...@acm.org
Reporter: iv...@ivosh.net
Target Milestone: ---
VEX IR optimizer should optimize CmpNEx(a, 0) as CmpNEZx(a).
CmpNEx(a, 0) is typically produced by VEX frontends for emulation warnings.
For example in guest_x86_toIR.c:
4110 /* Finally, if an emulation warning was reported,
4111 side-exit to the next insn, reporting the warning,
4112 so that Valgrind's dispatcher sees the warning. */
4113 stmt(
4114 IRStmt_Exit(
4115 binop(Iop_CmpNE32, mkexpr(ew), mkU32(0)),
4116 Ijk_EmWarn,
4117 IRConst_U32( ((Addr32)guest_EIP_bbstart)+delta),
4118 OFFB_EIP
4119 )
4120 );
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