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authorJoseph Myers <joseph@codesourcery.com>2015-05-22 17:48:45 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-05-22 17:48:45 +0000
commit31a8780d0b41934c6ab5160f834f56a2d5d97f4a (patch)
treef8caf31e82643454433f5dcdd8e14fd90d2fbbbd
parentfded7ed684b17e42a5cc5434e799166ca2df1643 (diff)
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Fix ldbl-128 / ldbl-128ibm erfcl for -Wuninitialized
The ldbl-128 and ldbl-128ibm implementations of erfcl produce uninitialized variable warnings with -Wuninitialized because of switch statements where in fact one of the cases will always be executed, but the compiler does not see that these cases cover all possibilities (and because the reasoning that it does involves inequalities on the representation of a floating point value leading to a set of possible values for 8.0 times that value, converted to int, it's highly nontrivial for the compiler to see that). This patch fixes those warnings by converting the last case in those switch statements to a "default" case. Tested for powerpc and mips64. * sysdeps/ieee754/ldbl-128/s_erfl.c (__erfcl): Make case 9 in switch statement into default case. * sysdeps/ieee754/ldbl-128ibm/s_erfl.c (__erfcl): Likewise.
-rw-r--r--ChangeLog4
-rw-r--r--sysdeps/ieee754/ldbl-128/s_erfl.c2
-rw-r--r--sysdeps/ieee754/ldbl-128ibm/s_erfl.c2
3 files changed, 6 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog
index 21c4fa6..5b31961 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
2015-05-22 Joseph Myers <joseph@codesourcery.com>
+ * sysdeps/ieee754/ldbl-128/s_erfl.c (__erfcl): Make case 9 in
+ switch statement into default case.
+ * sysdeps/ieee754/ldbl-128ibm/s_erfl.c (__erfcl): Likewise.
+
* sysdeps/ieee754/ldbl-128/e_asinl.c (__ieee754_asinl): Don't use
a conditional in forcing "inexact".
* sysdeps/ieee754/ldbl-128ibm/e_asinl.c (__ieee754_asinl):
diff --git a/sysdeps/ieee754/ldbl-128/s_erfl.c b/sysdeps/ieee754/ldbl-128/s_erfl.c
index 9bfc9c5..fa4609f 100644
--- a/sysdeps/ieee754/ldbl-128/s_erfl.c
+++ b/sysdeps/ieee754/ldbl-128/s_erfl.c
@@ -874,7 +874,7 @@ __erfcl (long double x)
y = C19b + z * neval (z, RNr19, NRNr19) / deval (z, RDr19, NRDr19);
y += C19a;
break;
- case 9:
+ default: /* i == 9. */
z = x - 1.125L;
y = C20b + z * neval (z, RNr20, NRNr20) / deval (z, RDr20, NRDr20);
y += C20a;
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_erfl.c b/sysdeps/ieee754/ldbl-128ibm/s_erfl.c
index f55e8b7..f6fcf48 100644
--- a/sysdeps/ieee754/ldbl-128ibm/s_erfl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/s_erfl.c
@@ -894,7 +894,7 @@ __erfcl (long double x)
y = C19b + z * neval (z, RNr19, NRNr19) / deval (z, RDr19, NRDr19);
y += C19a;
break;
- case 9:
+ default: /* i == 9. */
z = x - 1.125L;
y = C20b + z * neval (z, RNr20, NRNr20) / deval (z, RDr20, NRDr20);
y += C20a;