Souper says:
; Function: fn1
%0:i8 = var
%1:i32 = zext %0
%2:i32 = var
%3:i1 = ne 0:i32, %2
%4:i32 = sext %3
%5:i1 = slt %1, %4
cand %5 0:i1
COMMAND: /home/regehr/souper/build/souper -stp-path=/usr/local/bin/stp reduce_373/foo.bc
LLVM says:
define void @fn1() #0 {
entry:
%0 = load i32* @a, align 4, !tbaa !1
%not.cmp = icmp ne i32 %0, 0
%sub = sext i1 %not.cmp to i32
%1 = load i8* @b, align 1, !tbaa !5
%conv1 = zext i8 %1 to i32
%cmp2 = icmp sgt i32 %sub, %conv1
%conv3 = zext i1 %cmp2 to i32
store i32 %conv3, i32* @c, align 4, !tbaa !1
ret void
}
COMMAND: /home/regehr/souper/third_party/llvm/Debug/bin/clang -c -w -emit-llvm -O3 reduce_373/foo.c -o reduce_373/foo.bc
C source code:
int a, c;
unsigned char b;
void fn1() { c = (0 == a) - 1 > b; }
x86-64 from LLVM:
fn1: # @fn1
xorl %eax, %eax
cmpl a(%rip), %eax
sbbl %eax, %eax
movzbl b(%rip), %ecx
cmpl %ecx, %eax
setg %al
movzbl %al, %eax
movl %eax, c(%rip)
retq
COMMAND: /home/regehr/souper/third_party/llvm/Debug/bin/clang -w -O3 reduce_373/foo.c -S -o -
x86-64 from GCC:
fn1:
movl $0, c(%rip)
ret
COMMAND: gcc -w -O3 reduce_373/foo.c -S -o -