1; Note the formula for negative number alignment calculation should be y = x & ~(n-1) rather than y = (x + (n-1)) & ~(n-1). 2; after patch https://reviews.llvm.org/D34337, we could save 16 bytes in the best case. 3; RUN: llc -verify-machineinstrs -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr8 < %s | FileCheck %s -check-prefix=CHECK-BE 4; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu -mcpu=pwr8 < %s | FileCheck %s -check-prefix=CHECK-LE 5 6define signext i32 @bar(i32 signext %ii) { 7entry: 8 %0 = tail call i32 asm sideeffect "add $0, $1, $2\0A", "=r,r,r,~{f14},~{r15},~{v20}"(i32 %ii, i32 10) 9 ret i32 %0 10; Before the fix by patch D34337: 11; stdu 1, -544(1) 12; std 15, 264(1) 13; stfd 14, 400(1) 14; stdu 1, -560(1) 15; std 15, 280(1) 16; stfd 14, 416(1) 17 18; After the fix by patch D34337: 19; CHECK-LE: stdu 1, -528(1) 20; CHECK-LE:std 15, 248(1) 21; CHECK-LE:stfd 14, 384(1) 22; CHECK-BE: stdu 1, -544(1) 23; CHECK-BE:std 15, 264(1) 24; CHECK-BE:stfd 14, 400(1) 25} 26 27define signext i32 @foo() { 28entry: 29 %call = tail call signext i32 @bar(i32 signext 5) 30 ret i32 %call 31} 32 33