[llvm-bugs] [Bug 45086] New: ExpandMemcmp fails to constant fold in the general case
via llvm-bugs
llvm-bugs at lists.llvm.org
Tue Mar 3 05:59:00 PST 2020
https://bugs.llvm.org/show_bug.cgi?id=45086
Bug ID: 45086
Summary: ExpandMemcmp fails to constant fold in the general
case
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedbugs at nondot.org
Reporter: clement.courbet at gmail.com
CC: llvm-bugs at lists.llvm.org
define i1 @length2_gt_const(i8* %X, i8* %Y) nounwind {
; X64-LABEL: length2_gt_const:
; X64: # %bb.0:
; X64-NEXT: movzwl (%rdi), %eax
; X64-NEXT: movzwl .L.str+{{.*}}(%rip), %ecx
; X64-NEXT: rolw $8, %ax
; X64-NEXT: rolw $8, %cx
; X64-NEXT: movzwl %ax, %eax
; X64-NEXT: movzwl %cx, %ecx
; X64-NEXT: subl %ecx, %eax
; X64-NEXT: testl %eax, %eax
; X64-NEXT: setg %al
; X64-NEXT: retq
%m = tail call i32 @memcmp(i8* %X, i8* getelementptr inbounds ([513 x i8],
[513 x i8]* @.str, i32 0, i32 1), i64 2) nounwind
%c = icmp sgt i32 %m, 0
ret i1 %c
}
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