From 197fc75ab9850402b47d79da2e6cde47c8deb7d4 Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Sun, 2 May 2021 11:52:48 -0700
Subject: qbe: Use fixed precision of 17 when printing floating point constants
It appears that some operating systems don't yet support the C11
DBL_DECIMAL_DIG. In order to ensure consistent output no matter the
precision of long double (which varies from arch to arch), just use
a fixed 17, which is sufficient for IEEE 754 binary64.
---
qbe.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/qbe.c b/qbe.c
index 5d7c88a..2663085 100644
--- a/qbe.c
+++ b/qbe.c
@@ -1039,7 +1039,7 @@ emitvalue(struct value *v)
switch (v->kind) {
case VALUE_CONST:
if (v->repr->base == 's' || v->repr->base == 'd')
- printf("%c_%.*g", v->repr->base, DBL_DECIMAL_DIG, v->f);
+ printf("%c_%.17g", v->repr->base, v->f);
else
printf("%" PRIu64, v->i);
break;
@@ -1275,7 +1275,7 @@ dataitem(struct expr *expr, uint64_t size)
break;
case EXPRCONST:
if (expr->type->prop & PROPFLOAT)
- printf("%c_%.*g", expr->type->size == 4 ? 's' : 'd', DECIMAL_DIG, expr->constant.f);
+ printf("%c_%.17g", expr->type->size == 4 ? 's' : 'd', expr->constant.f);
else
printf("%" PRIu64, expr->constant.i);
break;
--
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