Souper says:
; Function: fn1
%0:i32 = var
%1:i1 = slt 0:i32, %0
%2:i32 = zext %1
%3:i32 = udiv 1:i32, %2
%4:i1 = ne 0:i32, %3
cand %4 1:i1
COMMAND: /home/regehr/souper/build/souper -stp-path=/usr/local/bin/stp reduce_367/foo.bc
LLVM says:
define void @fn1() #0 {
entry:
%0 = load i32* @a, align 4, !tbaa !1
%cmp = icmp sgt i32 %0, 0
%conv = zext i1 %cmp to i32
store i32 %conv, i32* @b, align 4, !tbaa !1
%div = udiv i32 1, %conv
%tobool = icmp ne i32 %div, 0
%div. = select i1 %tobool, i32 %div, i32 1
store i32 %div., i32* @c, align 4, !tbaa !1
ret void
}
COMMAND: /home/regehr/souper/third_party/llvm/Debug/bin/clang -c -w -emit-llvm -O3 reduce_367/foo.c -o reduce_367/foo.bc
C source code:
int a, b, c;
void fn1() {
b = a > 0;
c = 1 / b ?: 1;
}
x86-64 from LLVM:
fn1: # @fn1
cmpl $0, a(%rip)
setg %al
movzbl %al, %ecx
movl %ecx, b(%rip)
movl $1, %esi
movl $1, %eax
xorl %edx, %edx
divl %ecx
testl %eax, %eax
cmovnel %eax, %esi
movl %esi, c(%rip)
retq
COMMAND: /home/regehr/souper/third_party/llvm/Debug/bin/clang -w -O3 reduce_367/foo.c -S -o -
x86-64 from GCC:
fn1:
movl a(%rip), %edx
xorl %eax, %eax
movl $1, c(%rip)
testl %edx, %edx
setg %al
movl %eax, b(%rip)
ret
COMMAND: gcc -w -O3 reduce_367/foo.c -S -o -