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darwin: don't clobber X18 and FP registers

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These are reserved registers on MacOS so don't need to be clobbered, and
result in a compiler waring:

    ld.lld-14: warning: inline asm clobber list contains reserved registers: X18, FP
    Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
This commit is contained in:
Ayke van Laethem
2022-07-15 19:39:23 +02:00
committed by Ron Evans
parent 1f43f32aae
commit 4f729c323d
1 changed files with 11 additions and 1 deletions
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compiler/defer.go
+11 -1
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@@ -161,7 +161,17 @@ str x2, [x1, #8]
mov x0, #0 mov x0, #0
1: 1:
` `
constraints = "={x0},{x1},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15},~{x16},~{x17},~{x18},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{fp},~{lr},~{q0},~{q1},~{q2},~{q3},~{q4},~{q5},~{q6},~{q7},~{q8},~{q9},~{q10},~{q11},~{q12},~{q13},~{q14},~{q15},~{q16},~{q17},~{q18},~{q19},~{q20},~{q21},~{q22},~{q23},~{q24},~{q25},~{q26},~{q27},~{q28},~{q29},~{q30},~{nzcv},~{ffr},~{vg},~{memory}" constraints = "={x0},{x1},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15},~{x16},~{x17},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{lr},~{q0},~{q1},~{q2},~{q3},~{q4},~{q5},~{q6},~{q7},~{q8},~{q9},~{q10},~{q11},~{q12},~{q13},~{q14},~{q15},~{q16},~{q17},~{q18},~{q19},~{q20},~{q21},~{q22},~{q23},~{q24},~{q25},~{q26},~{q27},~{q28},~{q29},~{q30},~{nzcv},~{ffr},~{vg},~{memory}"
if b.GOOS != "darwin" {
// These registers cause the following warning when compiling for
// MacOS:
// warning: inline asm clobber list contains reserved registers:
// X18, FP
// Reserved registers on the clobber list may not be preserved
// across the asm statement, and clobbering them may lead to
// undefined behaviour.
constraints += ",~{x18},~{fp}"
}
// TODO: SVE registers, which we don't use in TinyGo at the moment. // TODO: SVE registers, which we don't use in TinyGo at the moment.
case "avr": case "avr":
// Note: the Y register (R28:R29) is a fixed register and therefore // Note: the Y register (R28:R29) is a fixed register and therefore