(mcyoung.xyz)

158 points transpute | 2 comments | 22 Oct 25 20:13 UTC | HN request time: 0.471s | source

1. mbauman ◴[22 Oct 25 21:50 UTC] No.45675610[source]▶

Forget compilers, SSA is an immensely valuable readability improvement for humans, too.

2. MeetingsBrowser ◴[23 Oct 25 04:46 UTC] No.45678241[source]▶

Why have

    while (c < 10) { c *= 3; }

when you could have

  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 %0, ptr %3, align 4
  br label %4, !dbg !18

  4:
  %5 = load i32, ptr %3, align 4, !dbg !19
  %6 = icmp slt i32 %5, 10, !dbg !20
  br i1 %6, label %7, label %10, !dbg !18

  7:
  %8 = load i32, ptr %3, align 4, !dbg !21
  %9 = mul nsw i32 %8, 3, !dbg !21
  store i32 %9, ptr %3, align 4, !dbg !21
  br label %4, !dbg !18

↑

Why SSA Compilers?